SEC grades at G1, G2 and G3 are not reported on one universal scale. Under Singapore’s 2027 Secondary Education Certificate (SEC), G1 uses letter grades A to E, G2 uses grades 1 to 6, and G3 uses the familiar A1 through 9 structure. When a post-secondary admission route requires subjects from different levels to be counted together, SEAB provides specific downward grade mapping rules. This mapping is for the relevant aggregate calculation; it does not convert a child’s learning into one permanent ability label.
Parents should begin with the actual subject, its G-level and the original grade. Only then should they check the admission formula for a particular course or pathway. A grade can look different when mapped, while the original result remains what it was. Below are the official tables, a worked example, and the questions that prevent the most common family misunderstandings.
SEC grade mapping: immediate answers
- G1 grades: A, B, C, D and E.
- G2 grades: 1, 2, 3, 4, 5 and 6.
- G3 grades: A1, A2, B3, B4, C5, C6, D7, E8 and 9.
- G3 to G2: SEAB supplies a mapping table for eligible post-secondary aggregate calculations.
- G2 to G1: another official table applies when a specific progression route needs grades at G1 standard.
- Not every subject is counted: a course’s aggregate formula decides which subjects and levels are eligible.
- Start with SEAB: never rely on an unofficial “convert all SEC grades” calculator without checking the relevant route’s rules.
1. Read the original grade before trying to calculate anything
Imagine a parent receiving a future SEC result showing G3 English Language B4, G3 Mathematics A1 and G2 Chinese Language 5. Those are three subject results at two different curricular levels. There is no need to force them into one invented “overall grade.” The certificate records the subject levels actually attempted, and that information matters to institutions considering the student’s next course.
SEAB states that the SEC keeps the overall examination standards corresponding to the earlier N(T)-, N(A)- and O-Level levels. It is therefore inaccurate to tell parents that an A in G1 is “the same” as an A1 in G3. They come from distinct subject standards and grading structures. It is equally inaccurate to tell a child that an excellent performance in a G1 subject is worthless because a different student sat for G3. The result should be understood within the learning and assessment it represents.
| Subject level | Official SEC grade set | What parents should notice |
|---|---|---|
| G1 | A, B, C, D, E | Letter grades belong to G1 examinations; there is no A1 at this level |
| G2 | 1, 2, 3, 4, 5, 6 | Numeric grades belong to G2 examinations; a “2” is not automatically a G3 A2 |
| G3 | A1, A2, B3, B4, C5, C6, D7, E8, 9 | The grade belongs to a G3 subject and can be mapped only when a route permits |
A helpful habit: write results in the order subject → subject level → original grade → relevant admission rule. It sounds simple, but it prevents parents from making calculations with numbers that belong to different systems.
2. The official SEC grade-mapping tables
The following mappings come from SEAB’s published SEC information. They are used when a specified post-secondary admission aggregate needs grades from subjects taken at more demanding levels. The mappings run down to the less demanding level for the relevant calculation. They are not instructions to promote a G1 grade to a hypothetical G3 grade.
G3 subject grade mapped down to G2
| Original G3 grade | Mapped G2 grade |
|---|---|
| A1, A2 or B3 | 1 |
| B4, C5 or C6 | 2 |
| D7 | 3 |
| E8 | 4 |
| 9 | 5 |
Notice that several different original G3 grades can map to the same G2 grade. That is expected. A mapping table is designed for a particular administrative comparison; it is not a detailed explanation of every distinction in the original paper.
G2 subject grade mapped down to G1
| Original G2 grade | Mapped G1 grade |
|---|---|
| 1, 2 or 3 | A |
| 4 | B |
| 5 | C |
| 6 | D |
If an admission route requires a G3 subject to be counted at the G1 level, SEAB says the conversion goes in two stages: G3 to G2, then G2 to G1. Do not skip a stage, reverse the direction or invent a direct percentage conversion. Also note that these tables describe how available grades map; they do not imply that every possible grade or subject can be used in every application.
3. Worked example: how an ELMAB3 aggregate is calculated at G2 level
ELMAB3 refers to English Language, Mathematics and three other eligible subjects. It is used in specified routes such as the Polytechnic Foundation Programme and direct entry into Year 2 of Higher Nitec, subject to the applicable admission criteria. The following example uses the subject results that SEAB itself illustrates in its SEC guidance. The arithmetic helps show the mapping; it is not an admission decision.
| Subject and original result | G2 value for this example | Why |
|---|---|---|
| G3 English Language — B4 | 2 | G3 B4 maps down to G2 2 |
| G3 Mathematics — A1 | 1 | G3 A1 maps down to G2 1 |
| G3 Science — B3 | 1 | G3 B3 maps down to G2 1 |
| G2 Combined Humanities — 2 | 2 | Already at G2 |
| G2 Chinese Language — 5 | 5 | Already at G2 |
| Illustrative aggregate | 11 | 2 + 1 + 1 + 2 + 5 |
Suppose the same student also took G1 Computing and obtained grade A. SEAB’s published example does not map that subject for this particular ELMAB3 computation. Adding the G1 A to the number 11 would be a mistake. The five subjects used are determined by the relevant formula and eligibility rules, not by a desire to include every high grade on the certificate.
Why an aggregate of 11 does not automatically mean “admitted”
Every route can have other requirements: minimum grades for particular subjects, appropriate levels, subject groupings, course-specific conditions and competitive selection. The aggregate is one component of a wider admission check. A family that sees an attractive total should still read the official criteria for the programme and year in question. It is safer to build a checklist than to treat one number as a verdict.
4. Mapping is a route-specific rule, not an assessment of your child’s worth
A grade reflects performance in a particular assessment under particular conditions. It is not a direct measurement of curiosity, practical ability, creativity, persistence or the total amount a student has learned. That distinction becomes especially important under Full SBB, because students may take different subjects at different levels.
Consider two students, both of whom enjoy Mathematics. The first can manipulate equations quickly but often skips units in real-world problems. The second works more slowly but can explain the meaning of every step. A single mark may rank one higher on one paper. Yet the right teaching intervention for each is different: checking habits for one, fluency and speed for the other. Those patterns do not appear on the SEC certificate. Parents need to use the grade as evidence, then inspect the work behind it.
Similarly, the decision to offer a subject at G3 may be sensible because it supports a future course, but it should be paired with enough time to build genuine foundations. A student who repeatedly memorises methods without understanding them can carry invisible gaps from one academic year into the next. Grade mapping cannot repair that problem. Only learning and feedback can.
5. Five grade-calculation mistakes worth avoiding
- Equating grade labels across levels: G2 grade 2 is not automatically the same achievement as G3 A2. Always read the full subject level.
- Mapping grades in the wrong direction: SEAB’s table maps from a more demanding level to a less demanding level for specified purposes. It does not create an imaginary higher-level result.
- Using the mapping for every possible subject: programme rules determine which grades count. Some subjects cannot be used in a particular aggregate.
- Mixing gross and net aggregate scores: a bonus-point rule, when available, belongs to the relevant admission exercise; it should not be silently included in the raw subject-grade arithmetic.
- Assuming a minimum aggregate guarantees a place: passing a published eligibility threshold may allow an application, while actual placement depends on the applicable process and available places.
When a calculator or social post gives a surprising result, check the original grades against SEAB’s mapping table and then open the official page for the exact route. If the site simply says “all SEC scores converted,” be sceptical. A trustworthy tool should name the year, the formula, the subjects counted and the policy source.
6. What does it mean to receive an SEC certificate?
SEAB explains that the result certificate will reflect all subjects taken at the different levels. The published award threshold is at least one G3 subject at E8 or better, or one G2 subject at grade 5 or better, or one G1 subject at grade D or better. This certificate-award rule must not be confused with the much more specific entry requirements for a JC, polytechnic course, PFP cluster or ITE programme. Receiving a certificate and qualifying for a chosen course answer different questions.
For parents, separate the situation into three statements: What did the student actually attempt? What result was achieved? What does the next institution require? Only the third statement determines whether a particular route is open. A family could have a valid certificate and still need another pathway to reach a specific course. That is normal planning, not evidence that secondary education has failed.
7. A grade conversation that helps rather than harms
When a student receives a grade below expectations, the first conversation should not be an argument about rank. Ask which questions felt unfamiliar, where time ran out, and whether the student can identify a principle they misunderstood. It may be possible to repair an important gap long before the next national examination. It is also possible that the chosen level or total academic load deserves review with the school.
Here is a practical family sequence:
- Read the original subject results and levels exactly as stated.
- Identify the route the child is interested in, without assuming a single route is the only respectable one.
- Find the official admission year and minimum course requirements.
- Apply downward mapping only if that route explicitly requires it.
- Check subject-specific grades and other conditions before adding any aggregate.
- Keep a second route available and discuss it with a school education and career guidance teacher where needed.
This approach gives the child a future to think about while respecting the actual meaning of their results.
Frequently asked questions about SEC grade mapping
Does G3 A1 always become G2 grade 1?
When a particular post-secondary aggregate calculation requires the official G3-to-G2 mapping, G3 A1 maps to G2 grade 1. The original SEC grade remains G3 A1.
Can a G2 grade 1 be written as G3 A1?
No. That would reverse the mapping and suggest an examination the student did not take.
Can I convert G1 A directly to a G3 grade?
No official upward mapping of that kind is provided for this purpose. Use the actual G1 result and the admission route’s stated rules.
Does my child need all G3 subjects to progress after SEC?
Not for every route. Eligibility depends on the programme. Different routes recognise different combinations of subjects and, where applicable, mapped grades.
Can I use the same ELMAB3 calculation for every post-secondary course?
No. Different courses and pathways may use different aggregates, subject levels and minimum grades. Read the official rules rather than reusing a number.
Is a mapped grade shown as the only grade on the SEC certificate?
No. The SEC reflects the subjects and levels taken. Mapping is used as required for specified post-secondary progression calculations.
Next useful reading
Start with eduKate’s detailed SEC certificate-reading guide if you are looking at a result slip. For subject-level decisions before Secondary 4, see when G-levels can change. For the overall school system, use how secondary school works under Full SBB. If Mathematics is the concern, the Clementi Secondary 1 Mathematics guide explains why the missing step behind an error often matters more than the mark.
Official sources
- SEAB — SEC grading, official grade mapping and aggregate example
- MOE — 2028 Post-Secondary Admissions Exercise
- MOE — Post-Secondary Admissions Exercise: current route eligibility
Checked 6 November 2026. Numerical examples are for understanding the published rule; they do not certify eligibility or predict placement. Confirm the admission year, course requirements and subject-level rules with MOE and the receiving institution.