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Everything to know about SEC (Singapore Education Certificate) | Which 2027 SEC Syllabus Code Should My Child Use—K100, K200 or K300?

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by

eduKate Asia
Three learners review open books together at a classroom table, with stacks of textbooks, stationery and a whiteboard in the bright room.

For the 2027 Singapore-Cambridge Secondary Education Certificate (SEC), use the syllabus code that matches your child’s actual subject, G1/G2/G3 level, examination year and school- or private-candidate status. For English Language, the codes are K100 at G1, K200 at G2 and K300 at G3. The letters and numbers are not interchangeable: a student taking G2 English must prepare for the G2 syllabus rather than switching to a G3 resource simply because it looks more advanced.

The safest starting point is the official SEAB 2027 school-candidate syllabus catalogue. Private candidates should use the separate official private-candidate catalogue. Find the exact row, open the syllabus and read its assessment requirements. This is more reliable than choosing a booklet by its cover colour, a seller’s ‘SEC-ready’ claim, or a code remembered from an older O-Level or N-Level paper.

This independent eduKateSG guide was fact-checked against SEAB’s published 2027 G1, G2 and G3 tables on 17 October 2026. Schools and SEAB remain the authorities for individual registration details and future changes.

The answer in one minute

  • G1 English Language: K100.
  • G2 English Language: K200.
  • G3 English Language: K300.
  • G1 Mathematics: K110.
  • G2 Mathematics: K210.
  • G3 Mathematics: K310.
  • G1 Science: K123.
  • G2 Science examples: K223 (Physics, Chemistry), K224 (Physics, Biology), K225 (Chemistry, Biology).
  • G3 Combined Science examples: K326, K327 and K328 for their respective discipline pairings.
  • G3 Pure Sciences: Physics K323, Chemistry K324 and Biology K325.

These are examples, not a complete subject catalogue. Many languages, humanities, arts and applied subjects have their own codes. SEAB’s current official table is the controlling reference, especially if a student’s elective has a restricted school offering or separate examination components.

Jump to the useful sections

What a syllabus code actually does

A syllabus code is an identifier for a particular examinable subject or subject combination in a particular examination system. It helps students, schools, publishers and examining authorities point to the same specification. A code is not an intelligence score, a ranking of the student, or a promise about the difficulty of one individual question. It identifies the syllabus to be studied and assessed.

Imagine a parent asking the Mathematics department, ‘Which Maths should we buy?’ The teacher needs to know whether the student takes G1 Mathematics, G2 Mathematics, G3 Mathematics or a different subject such as Additional Mathematics. These distinctions affect scope, question format, assumed knowledge and what counts as appropriate practice. The label ‘Secondary 4 Maths’ does not settle them. A correct examination code solves a simple but consequential identification problem.

Because SEC begins in 2027, an old GCE code may appear alongside the new code in SEAB’s table as a reference to the 2026-and-earlier syllabus. That historical column is useful for comparison; it should not silently replace the code intended for a 2027 SEC examination.

Start with the subject, not the code number

Families sometimes hear ‘K300’ and immediately assume they have found the correct study material because the number begins with 3. But codes are meaningful only alongside the subject title. K300 happens to identify G3 English Language in the official 2027 catalogue. K310 identifies G3 Mathematics; K341 identifies G3 Additional Mathematics. All are G3 codes, but they describe different examinations.

A workable method is to write a four-part label on each textbook and digital folder: 2027 SEC / exact subject / G-level / K-code. For example, ‘2027 SEC — Mathematics — G2 — K210’. The ordering is intentional. The child first recognises the subject they are learning, then the level, then the precise official identifier. This avoids letting the code become more important than the knowledge and skills the code represents.

If an examination notice states a different title from a student’s handwritten label, stop and compare the full entry. Some names sound similar while representing distinct syllabus combinations. Resolve the discrepancy with the school or SEAB before buying a course or registering privately.

How to use the 2027 school-candidate syllabus site

Go to the SEAB SEC overview, choose the school-candidate syllabus section and then choose G1, G2 or G3. Each level has an official subject table. Look for the full title, language medium, the Subject Code (2027) column and any note about availability, examination format or specimen papers. Click the subject title to read its syllabus document.

Check the document’s examination year and code on its cover or identification details, not just the download filename. Read the sections describing assessment objectives, content topics and paper or component structures. A reputable revision book can still be unsuitable if it follows an older specification or the wrong subject combination. The real question is whether it trains the same knowledge and skills as the current official syllabus.

Keep a dated record of the page consulted. SEAB can revise or clarify candidate instructions, especially before the first SEC sitting. A screenshot of a search snippet from an unknown website is weaker evidence than the current official catalogue and document.

English Language: three codes, three subject levels

SEAB’s 2027 school-candidate lists identify English Language at G1 as K100, G2 as K200 and G3 as K300. The codes reflect distinct subject levels under the same national certificate. Students do not automatically move from one code to the next because they finish a chapter, score well in a single test or admire someone else’s subject combination. Their official school programme and examination entry govern the syllabus they should follow.

An effective teacher can use shared language activities across levels—such as distinguishing an inference from a quoted fact—while changing the depth, complexity and assessment requirements appropriate to the learner. The existence of three codes does not mean three entirely unrelated languages. Rather, it allows the assessment to reflect different subject-level expectations. Families should check the specific reading, writing, listening and oral requirements of the student’s document.

The eduKate guide comparing G1, G2 and G3 English examines the learning differences in more depth. This page helps parents choose the correct document first.

Mathematics: K110, K210 and K310 are not Additional Mathematics

SEAB lists Mathematics as K110 (G1), K210 (G2) and K310 (G3) in the 2027 catalogues. It separately lists Additional Mathematics where that subject is offered, including K232 at G2 and K341 at G3. A book promising ‘G3 Mathematics’ is therefore not automatically a complete Additional Mathematics resource. Their syllabus aims and assessment structures must be checked separately.

A parent may own a pile of old O-Level Elementary Mathematics papers with the reference code 4052. SEAB’s 2027 table lists 4052 as the earlier code corresponding to G3 Mathematics K310. That relationship makes old questions potentially useful for practising relevant skills, but it does not make an old 4052 cover the authoritative 2027 specification. Compare topics and assessment requirements before allocating revision time.

This is particularly important when tuition begins halfway through the school year. Ask the tutor to work from the child’s actual current syllabus and school material. If the student struggles with algebraic fractions, tackle that difficulty at an appropriate level rather than prescribing a different course on the basis of the student’s age.

Science: a subject combination is part of the title

Science shows why checking only the leading K-number is inadequate. The 2027 G1 catalogue has Science K123. The G2 catalogue has combinations such as Science (Physics, Chemistry) K223, Science (Physics, Biology) K224 and Science (Chemistry, Biology) K225. At G3, Combined Science offerings similarly distinguish discipline pairings using K326, K327 and K328. The separate G3 Pure Sciences include Physics K323, Chemistry K324 and Biology K325.

A child taking G2 Physics and Chemistry should not buy a Chemistry-and-Biology book merely because both are labelled ‘Combined Science’. One discipline is missing and the other is added. That creates substantial gaps. Similarly, an individual pure Physics syllabus is not identical to the Physics component of Combined Science; a title that contains ‘Physics’ does not establish an examination match.

When checking Science, write out the entire combination and level, for example ‘2027 SEC G2 Science (Physics, Chemistry), K223’. Then verify the listed papers, any practical or electronic assessment requirements, and the skills expected in the correct syllabus. See eduKate’s G1/G2/G3 Science comparison for the subject-level explanation.

Humanities: an apparently small name difference can change the paper

In the G2 2027 list, the combined Humanities options include Humanities (Social Studies, Geography) K229, Humanities (Social Studies, History) K230 and Humanities (Social Studies, Literature in English) K231. The G3 catalogue likewise distinguishes Humanities (Social Studies, Geography) K335, Humanities (Social Studies, History) K336 and Humanities (Social Studies, Literature in English) K337.

This matters because the second named component is not decorative. A student preparing History-based sources and explanations needs a different content map from someone preparing geographical inquiry or literary interpretation. All may benefit from evidence-based writing, but exam practice must match the actual component and its marking requirements. A generic ‘Humanities question bank’ should be used only after the family checks which pages apply.

Parents can ask a straightforward question at home: ‘When you say Humanities, is the other component History, Geography or Literature in English?’ The answer tells you which official row to open. If you are uncertain about the school’s combination, use the school’s documented subject offering rather than guessing from a friend at another school.

Mother Tongue and Higher Mother Tongue are different entries

The official lists have distinct codes for Chinese, Malay, Tamil and relevant Higher Mother Tongue subjects. For instance, G1 Chinese Language is K120, G2 Chinese Language K220 and G3 Chinese K320. G3 Higher Chinese is listed separately as K355. That means ‘Chinese’ and ‘Higher Chinese’ are not interchangeable syllabus labels, even if a family naturally describes both as learning the same mother tongue.

Mother Tongue planning also interacts with the unusual 2026–2027 transition. The first SEC sitting begins in 2027, and SEAB has a specific FAQ for the 2024 Secondary 1 cohort taking ordinary Mother Tongue in 2026 while offering Higher Mother Tongue. Do not assume that a 2026 GCE result becomes a 2027 SEC result or that a student’s age alone establishes which examination certificate they earned.

Before selecting revision papers, confirm the school’s actual examination year and level, not just the student’s Secondary 3 or Secondary 4 label. That is especially important for candidates who take an ordinary language examination earlier than another subject.

How old GCE codes appear in the 2027 catalogue

SEAB’s tables explicitly include a column for ‘Subject Code for reference (2026 and earlier)’ beside the 2027 code. This is a useful bridge across the reform. For example, the G1 English row gives 1195 as the earlier code for K100, G2 English gives 1190 for K200, and G3 English gives 1184 for K300. The previous-code column helps identify predecessor materials but does not change the official 2027 identifier.

Parents should label older practice clearly: ‘2026-and-earlier GCE reference paper — checked for overlap with 2027 SEC syllabus’. If the exam structure is comparable, selected exercises may still be useful. If the syllabus is revised, or the child studies a new subject, greater care is needed. Do not claim that an old paper is a real SEC past-year paper when SEC’s first national examination has not yet occurred.

This is a good place to teach students source literacy: date, code, level and provenance matter. That habit will later help them evaluate online notes, model answers and apparently authoritative social-media uploads.

What ‘new’, ‘revised’ and ‘refined’ can mean

Some 2027 tables mark a subject as New, Revised or Refined. These are not synonyms for ‘harder’. They call attention to syllabus status or changes. SEAB explains on certain entries that ‘Refined’ can mean changes to content without changes to the assessment scheme; other entries provide specimen papers for the relevant updated assessment materials. The specific table note and subject document are essential.

For example, G2 Computing K237 is listed as New in the school-candidate table, and the catalogue includes specimen-paper links. This is different from a familiar subject with an unchanged assessment scheme. An honest tutor should compare the published 2027 syllabus and source documents rather than reassuring parents that every question must be identical to the previous examination year’s papers.

EduKate has an existing specialist guide, What Do New, Refined and Revised Mean in SEC Syllabuses?. Use it for the terminology. Our present question remains the practical one: how to find the right code for the child.

Do not treat the first digit as a universal eligibility guarantee

The K1xx/K2xx/K3xx code groupings are a convenient way to orient yourself within the official 2027 SEC catalogue. They are not a substitute for reading the subject title, candidate category and notes. An applied subject may be restricted to approved schools. A school may not offer every nationally listed elective. A private-candidate list may omit a school-only option.

A parent might see a G3 applied-subject code and reason, ‘My child likes this topic, so we can simply register for it.’ That conclusion skips eligibility and availability. First confirm that the subject exists in the student’s school, that the school is approved to offer it where required, and that the student’s intended course of study includes the correct assessment components.

The broader lesson is that an identifier locates a rule; it does not grant permission by itself. Schools and examining authorities use these distinctions to keep education and assessment organised. Parents can support the child’s interests while checking realistic access to the desired subject.

Why school candidates and private candidates use different lists

SEAB publishes parallel 2027 G-level catalogues for school and private candidates. Although many common subjects appear in both, the available entries, details and practical arrangements are not necessarily identical. Candidates outside school need to confirm their available subjects through the private-candidate pages and follow the relevant registration instructions when released.

For example, a candidate interested in Science should check whether the particular G-level and combination appears in the private list rather than copying a friend’s school-based code. Certain applied subjects may involve approved school facilities or course arrangements and should not be assumed available to all individuals. Registration questions should be directed to the official Candidates Portal guidance, not inferred from a specimen paper appearing online.

The eduKate school-versus-private SEC guide explores the wider difference. This page provides the syllabus-identification method that both groups can use.

A step-by-step search example for a school candidate

Suppose Aisha is a hypothetical Secondary 4 student whose school teaches G2 English, G3 Mathematics, G2 Science (Physics, Chemistry) and G3 Humanities (Social Studies, Geography). The parent wants one accurate revision folder per subject. First, write the full subject names and actual G-levels from the school record. Second, open the G2 and G3 school-candidate catalogues. Third, identify the corresponding codes: K200 English, K310 Mathematics, K223 Science (Physics, Chemistry) and K335 Humanities (Social Studies, Geography).

Fourth, open each subject syllabus PDF and note its examination components, assessment objectives and special instructions. Fifth, file practice material under the correct heading. Aisha’s folder can now be checked by a teacher or tutor without guesswork. If the school’s official entry differs from the family’s notes, the family should use the school as the source for correcting its plan.

This illustrative example is not a recommendation that every learner should take those four subjects. It simply demonstrates how a mixed-level SEC profile requires careful code matching without implying that the student’s Posting Group dictates each examination entry.

A different example for a family revising Mathematics

Suppose Ben takes G1 Mathematics K110 and struggles with fractions, units and word-problem translation. His parent sees a thick G3 K310 practice book and believes harder questions must be better preparation. The label on the book is evidence of a mismatch, not evidence that Ben lacks ambition. The immediate learning need is to secure the ideas demanded by his current syllabus and gradually extend when readiness grows.

The family can begin with a fresh G1-aligned diagnostic: percentage changes, simple algebraic relationships or multi-step numerical interpretation at an appropriate level. After identifying an error, the tutor can revisit a simpler representation, ask Ben to explain the method and then set a new problem without hints. Progress is judged by increasing independent accuracy, not by how impressive the practice-paper cover looks.

If Ben’s school later considers a change of subject level, that is a separate decision involving academic readiness and the school’s official guidance. It should not be made solely because the family bought different material.

A Science worked example: why the combination matters

Imagine a worksheet asking a student to explain why a temperature rises during a controlled heating investigation. The underlying scientific reasoning may be relevant in more than one Science pathway: identify energy transfer, measurement and the evidence supporting a conclusion. However, a G2 Science (Physics, Chemistry) learner and a G2 Science (Chemistry, Biology) learner do not necessarily have identical examinable content or the same distribution of discipline-specific questions.

To prepare honestly, start with the actual code. If it is K223, open that syllabus’s Physics-and-Chemistry content and paper specification. Ask the student to interpret a graph: independent variable on one axis, dependent variable on the other, units, and what can be concluded without exaggeration. Then connect the example to the relevant topic. Do not conclude that successful performance on one general Science skill means an unrelated Biology topic can be omitted from another student’s requirements.

The result is precise teaching: the same good method—observation, explanation and checking—applied to the correct subject combination.

What to do when the teacher, tutor and book use different names

Begin by collecting the labels exactly as printed. A school might say ‘E-Math’, a tutor might say ‘G3 Mathematics’, and a textbook might display an older numeric code. These labels can refer to overlapping historical or informal contexts, but the official registration and 2027 syllabus entry must settle the examination identity. Make a small comparison chart rather than arguing about whose terminology is familiar.

Write five fields: official subject title; G-level; 2027 K-code; 2026-and-earlier reference code if one exists; and intended use of the resource. The final field might say ‘concept explanation’, ‘2027 specimen’, ‘selected old GCE practice’ or ‘school assessment’. Once each item is labelled, disagreement becomes a factual comparison and not a debate about whether the child should ‘study harder’.

If a teacher says a particular older question is suitable, ask which learning objective it targets and whether the exam format has changed. That question respects the teacher’s expertise while keeping the family’s file system honest.

How a tutor should use codes without turning a lesson into administration

The code belongs on the planning sheet, but not at the centre of every lesson. A good tutor uses it to identify the syllabus and assessment specification, then teaches the actual ideas. In English, the tutor might ask for an inference supported by a phrase and then a fuller explanation of how language affects a reader. In Mathematics, the tutor might diagnose a sign error before setting a differently structured equation. In History, the tutor can separate what a source says from what it proves.

The strongest lesson begins with independent evidence. Ask the learner to attempt an appropriate problem, explain the next step, receive targeted feedback and retry a novel version. A code can prevent misalignment; it cannot substitute for teaching. A large number of downloaded K-code-labelled files can produce the appearance of preparation while leaving misconceptions untouched.

Parents choosing tuition may ask: ‘Can you show me how today’s exercise maps to this 2027 SEC syllabus and what my child improved independently?’ That is a fair and practical question, regardless of whether tuition happens in a large class, a small group or at home.

A simple revision materials audit

Lay out every textbook, school worksheet, PDF and digital resource the student is using. Identify its intended subject, level, year and code. Mark the resource current, historical reference, supplementary concept practice, or not yet checked. Some items will be perfectly useful even without a prominent SEC label, especially for basic knowledge that remains part of the curriculum. Others may be misleading despite being newly marketed.

For each historical paper, ask the teacher or tutor whether the topic remains examinable and whether the question format suits the student’s intended examination. For a new or revised syllabus, check the official specimen material where provided. For a subject with practical or electronic assessment, make sure written practice does not crowd out the relevant skills. This audit is about appropriate use, not a blanket instruction to discard older material.

A family that completes the audit may discover it already has enough books. Better organisation and deliberate practice often add more value than another purchase prompted by an unfamiliar code.

Computing codes: a useful check against assumed continuity

Computing is another example of why a parent should read the whole row instead of inferring from a general subject name. SEAB’s 2027 lists identify G1 Computing K127, G2 Computing K237 and G3 Computing K349. The G1 and G2 entries are explicitly marked New in the school-candidate catalogues and include specimen links, while the G3 entry has its own code and reference details. The assessment requirements, software specifications and examination components should be inspected at the appropriate level rather than projected from another student’s course.

Suppose one child uses spreadsheets and Scratch in a G2 Computing context and another works through G3 Computing requirements. Their lessons may both involve logical thinking, but a family should not assume the same software list, task format or assessment timings. The official candidate-specific subject page is more useful than a broad label such as ‘coding’. It also helps teachers avoid giving a learner a technologically impressive project that does not meet the actual SEC task requirements.

At the same time, computing education is bigger than an examination paper. A student can enjoy programming clubs and problem-solving outside an examinable Computing subject. The code identifies formal assessment, while curiosity and practical creation can develop through other approved learning opportunities.

What if two syllabuses share a topic name?

Topic overlap does not mean the same assessment demand. Both G2 and G3 Mathematics may involve algebra, but the particular scope, methods and application demands must be read from each syllabus. Two English Language levels may both expect careful reading, but the passage complexity, response requirements and marking guidance are not automatically identical. A Geography enquiry task and a History source task may both discuss evidence, yet they evaluate it differently.

When learning across levels, teach the transferable idea explicitly and then return to the actual assessment. For instance, checking that units match is valuable across Science levels; it does not tell a student which experiment designs or chemical reactions are examinable. Similarly, a persuasive writing claim should be supported by reasons across levels, but the appropriate structure and depth will follow the specific syllabus.

This approach allows a child to build wider understanding without accidentally preparing for the wrong examination. It also respects progress as growing competence, not a race to collect more codes.

How to keep a family timetable aligned with the correct code

From 2027, SEAB schedules English Language and Mother Tongue written papers in September and most other written subjects during October–November. That broad arrangement is separate from each syllabus code and its paper or component instructions. A family can use the correct code to find what will be examined and then use the official timetable to decide when revision blocks should occur.

In a hypothetical week, an English learner might practise one reading passage on Tuesday, review feedback on Thursday and complete a short independent writing task on Saturday. A student studying Mathematics might alternate untimed explanation with timed mixed questions once methods are secure. The allocation should reflect actual examination needs, not a universal number of hours associated with K100, K200 or K300.

Do not infer precise 2027 examination dates from the broad month-level schedule. Wait for the official timetable and school instructions. The eduKate SEC exam timetable guide gives families a sensible place to follow those updates.

Five mistakes to avoid when using a subject-code list

Mistake one: choosing by year group alone. Secondary 4 does not determine a single universal G-level. Mistake two: matching the subject name but ignoring the second Science or Humanities component. Mistake three: treating a 2026-and-earlier GCE code as the 2027 SEC code. Mistake four: assuming a school-candidate offering can always be registered privately. Mistake five: using a specimen paper as evidence that an already completed SEC past-year examination exists.

Each mistake has the same remedy: return to the official year, title, level, candidate type and document. The code matters because it makes those checks possible. Once the family has verified the specification, the student can work on the skill rather than worrying about the label.

If a purchased resource is wrong, do not let it become a source of embarrassment. Set it aside, identify any transferable topics and replace it only if there is a genuine gap. The family has solved an information problem, not discovered a personal failure.

Frequently asked questions

Is K100 the code for every SEC G1 subject?

No. K100 identifies G1 English Language in the 2027 catalogue. G1 Mathematics is K110; G1 Science is K123; other G1 subjects have other identifiers. Always match the full subject title as well as the G-level.

Is K200 automatically the code for G2 Mathematics?

No. K200 is G2 English Language, while G2 Mathematics is K210. This is exactly why choosing by leading digit is unsafe. The code table should be read row by row, not inferred from a rough numerical pattern.

What is the 2027 code for G3 Additional Mathematics?

SEAB lists K341 for G3 Additional Mathematics and K310 for G3 Mathematics. These are different subjects with different specifications. Check your child’s actual combination and do not treat any G3 Mathematics resource as a complete Additional Mathematics guide.

Which code should a G2 Physics-Chemistry Science student use?

In SEAB’s 2027 school-candidate catalogue, Science (Physics, Chemistry) at G2 is K223. The Physics-Biology and Chemistry-Biology combinations have different codes. Write the disciplines in full so there is no misunderstanding.

Are 2026 GCE past-year papers automatically invalid for revision?

No. Some earlier questions may still teach relevant concepts or techniques. But the 2027 SEC syllabus is the governing specification, and new or revised entries may need different practice. Label historical papers accurately and use the official ‘reference code’ column as a bridge, not a replacement.

Can I buy only one book labelled ‘SEC Science’ for any G-level?

A single general-purpose book may be useful for transferable skills, but it cannot be assumed complete for every SEC Science syllabus. G1 Science, G2 combinations, G3 Combined Science and pure Physics, Chemistry or Biology have different entries. Check its coverage against the exact code.

Does a child in Posting Group 2 always need K2xx codes?

No. Posting Groups guide initial Secondary 1 placement. Full SBB allows subject-level combinations, and actual examined subjects may be at different G-levels. Use the recorded level for each subject, not the student’s Posting Group as a shortcut.

Can I choose K300 for English because my child wants a harder challenge?

Enrichment reading can be more demanding, but choosing the SEC examination level is a separate official educational decision. School candidates should follow their school’s subject-level and registration guidance. Private candidates must consult the current eligibility and syllabus availability rules. An exam code cannot be selected by desire alone.

Why does the SEAB table also show old four-digit codes?

The reference column helps users identify corresponding 2026-and-earlier GCE syllabuses and resources. The 2027 SEC column is the code to match for the first SEC examination. Both can be useful, provided the dates and purposes are clear.

Where do I find official specimen papers for revised syllabuses?

SEAB links available specimens from relevant 2027 subject rows. Not every row has a specimen, and some resources have copyright-related omissions in the online version. Open the official subject entry first; avoid assuming an unrelated downloadable paper matches the revised assessment.

Does the same subject code apply to private and school candidates?

Many common subjects use the same SEC code in the published lists, but the availability and candidate arrangements can differ. A matching number alone does not establish that a subject is privately registrable. Check the correct private-candidate catalogue and current SEAB procedures.

What if my school’s note and the official catalogue seem to disagree?

Bring the full subject title, level, year and code to the school’s examination team. Ask whether the school note refers to an older syllabus, an internal course label or a genuine entry discrepancy. For private candidates, use SEAB’s official support guidance. Do not change your preparation solely on the basis of a search result.

For subject differences, continue with G1/G2/G3 English, Mathematics and Science. For the structure of the qualification, see What is SEC. For learning across mixed levels, use the SEC revision-planning guide. For parents selecting support rather than just purchasing more papers, the eduKate three-student tutorial model illustrates diagnostic practice and careful progress checks.

Official sources and what each one verifies

Checked on 17 October 2026. Codes quoted above are from the official published 2027 tables. A later examination cohort should use its own official examination-year catalogue; nobody should assume all codes and requirements remain unchanged indefinitely.

The final parent answer

Use the exact 2027 SEC subject code for the subject your child really takes at the recorded G-level—K100 for G1 English, K200 for G2 English and K300 for G3 English—not a code guessed from the student’s age, Posting Group or an older GCE paper. Correct identification makes revision more focused. The next improvement comes from understanding, independent practice and feedback that genuinely develops the learner.