How Singapore Education Works | IP to IB Subject Choices: Six Groups, HL and SL Without Guesswork

Quick answer: Students in an IP pathway leading to the IB Diploma normally choose six subjects from six groups: language and literature, language acquisition, individuals and societies, sciences, mathematics and the arts. Students take three or four subjects at Higher Level (HL) and the remainder at Standard Level (SL). IB guidance specifies more teaching hours for HL than SL, but both levels use the same grade scale and grade descriptors. The school’s actual offerings, subject combinations and university prerequisites determine which options are possible.

There is no single subject combination that is best for every student. Choose with reference to interests, demonstrated strengths, intended university courses, school availability and the workload the student can sustain.

At a glance

Six groups form the Diploma breadth; one subject from each is the usual structure.
Three subjects minimum and four maximum at HL; remaining subjects at SL.
IB publishes 240 teaching hours for HL and 150 for SL.
Some interdisciplinary courses count across groups under IB rules.
School offering and university prerequisites are essential constraints.

The six subject groups explained

Group 1 covers Studies in Language and Literature. Group 2 covers Language Acquisition. Group 3 covers Individuals and Societies, including Economics, Geography, History, Psychology and Global Politics. Group 4 covers Sciences, including Biology, Chemistry, Physics and Computer Science. Group 5 is Mathematics. Group 6 is the Arts, including Music, Theatre, Dance, Film and Visual Arts.

Students typically select one subject from each group. IB rules allow an additional subject from certain other groups instead of an arts subject, and some interdisciplinary subjects satisfy requirements across two groups. These options must follow official IB and school rules; they are not arbitrary substitutions. See the IB Diploma curriculum.

Higher Level and Standard Level

HL subjects involve a broader scope and more teaching hours than SL subjects. IB guidance lists 240 teaching hours for HL and 150 for SL. Students take at least three and no more than four HL subjects, with the remaining subjects at SL. Both levels are assessed using the same grade descriptors, but HL expects a greater body of knowledge, understanding and skills.

HL is not simply a prestige badge. It requires sustained commitment and should be chosen where the student has genuine interest, readiness and a reason connected to later study. Some university courses require a particular HL subject or level; others have their own conditions. Read the IB subject-selection guidance.

Why the school’s subject list matters

The IB’s international subject catalogue is broader than what an individual Singapore school can offer in one cohort. Staffing, class size, language provision and timetable blocks affect the actual menu. A school might offer Economics HL but not every language or arts subject listed by the IB.

Ask for the official subject-choice booklet, timetable blocks and prerequisites. If a student wants Biology HL and Chemistry HL, check whether both can be timetabled together and whether the school permits the combination. A course appearing on the IB website does not guarantee a class at the student’s school.

Choosing a subject and choosing its level

There are two related decisions: which subject the student studies and whether it is taken at HL or SL. The same subject title at different levels can have different breadth and teaching hours. The correct level depends on foundations, interest, school criteria and later prerequisites.

A student who enjoys Physics but has unstable algebra may need to strengthen mathematical reasoning before selecting Physics HL. A pupil interested in Psychology should understand its reading, evaluation and research demands rather than judge it by popularity. Ask the school how it allocates levels and whether a choice can be reviewed.

Work backwards from university prerequisites

Some university courses specify required or preferred IB subjects and HL levels. Engineering programmes may require Mathematics at a particular level; Medicine may require Chemistry HL and another Science at HL under certain institutions’ rules. These conditions vary by university and application year.

A high overall score cannot necessarily replace a missing subject prerequisite. Check the intended course’s official admissions page and note whether its wording is mandatory or recommended. Keep two or three realistic options open rather than over-specialising at age 16.

Mathematics: Analysis and Approaches versus Applications and Interpretation

The IB offers Mathematics: Analysis and Approaches (AA) and Mathematics: Applications and Interpretation (AI), with HL and SL options subject to school availability. They differ in emphasis and should be chosen by examining the student’s mathematical interests and later requirements.

Do not reduce AA to “for smart students” and AI to “for weak students”. The names describe different emphases, not a judgement of personal worth. University prerequisites may specify one course or level, so check before deciding. Ask the school’s Mathematics department to explain actual content, assessment style and progression demands.

Science combinations and practical capability

Biology, Chemistry, Physics and Computer Science involve different forms of conceptual reasoning, data analysis and practical work. A student considering multiple HL Sciences should understand timetable and workload as well as intellectual content. University prerequisites may require a specific subject at HL; subjects in Group 4 are not interchangeable merely because they share a group.

A pupil interested in Medicine should check the exact Chemistry and second Science requirement. A student interested in Engineering should check Mathematics and Physics conditions. Strong foundations in algebra, graph reading, scientific vocabulary and experimental reasoning support every Science route.

Languages: school MTL and IB language groups

Singapore Mother Tongue arrangements and IB subject groups are related but not identical. An IP pupil may take MTL in lower secondary under MOE rules; the IB school’s Language A or Language B offerings in Years 5–6 follow the Diploma curriculum and the school’s authorised subject provision.

Check language background, proficiency, school offerings and university requirements. Do not assume MOELC Third Language study automatically determines an IB Language B level or qualifies a student for every course. See the IP Mother Tongue guide and MOELC Third Language guide.

A simple subject-combination example

A student interested in Engineering might consider Language A, a second language, Economics, Physics HL, Mathematics AA HL and an Arts subject or approved substitute. Another student interested in social sciences might consider Language A, Language B, History HL, Economics HL, Biology SL and Mathematics AI SL. These are illustrative combinations, not official recommendations or guaranteed school offerings.

The actual choices must meet IB subject-group rules, school timetable and university prerequisites. Use the IB’s published sample choices as a starting point, then confirm each course with the receiving school.

A workload check before finalising HL choices

Three HL subjects already require more teaching time than SL subjects; four HL subjects increase the commitment further. Consider the student’s CCA, CAS experiences, travel, Extended Essay, TOK, family commitments and rest. A high-intensity combination can be appropriate for a well-prepared learner, but should not be selected without understanding weekly demands.

Ask how many HL subjects the school recommends, whether students can change levels and what deadlines apply. See the IP study planning guide.

The conclusion: choose breadth and depth deliberately

The IB Diploma asks students to preserve breadth across six groups while studying selected subjects in greater depth. HL and SL are meaningful academic decisions, not labels to compare with friends. The best combination satisfies Diploma rules, is available at the school, preserves relevant future options and fits the student’s readiness.

Start with official course guidance and school information. Then work backwards from realistic university interests and have an honest conversation about workload. A sound subject plan gives the student room to learn deeply without sacrificing the rest of their development.

Frequently asked questions

How many subjects are in the IB Diploma?

Six subjects across the Diploma groups, alongside the core.

How many HL subjects must students take?

At least three and no more than four; the rest are SL.

How many teaching hours are HL and SL?

IB guidance describes 240 hours for HL and 150 for SL.

Can students replace the Arts subject?

IB rules allow certain subjects from other groups as substitutes; follow official requirements and the school arrangement.

Is Mathematics AA always better than AI?

No. They have different emphases and university prerequisites may specify a course or level.

Does every IP-to-IB school offer all IB subjects?

No. Each school publishes its actual subject offering.

Can a high IB total compensate for a missing HL prerequisite?

Not necessarily. Course-specific requirements must be met.

Should HL choices be made for prestige?

No. Choose by readiness, interest, availability and future requirements.

Official sources and update note

Reviewed 7 November 2026 against linked official guidance. This independent guide is not a school, university or admissions decision. Subject availability, entry criteria and examination requirements can change; verify the relevant year’s official pages and the student’s school handbook.