JC Subject Combination Guide: H1 vs H2 Singapore

JC subject combinations determine university options. Here is how H1 and H2 levels work, what each stream offers, and which combinations align with specific degree programmes.

The JC subject combination decision is one of the most consequential academic choices a student makes — it directly determines which university courses they can apply for, and changing subjects after JC1 is difficult — Ancourage Academy's JC tutors guide students through this decision every year. Unlike secondary school where the curriculum is largely fixed, JC students must choose between H1 and H2 levels, select a stream (Science, Arts, or Hybrid), and satisfy the contrasting subject requirement. The MOE A-Level curriculum provides the framework, but the specific combinations available vary by JC.

As Economics and Mathematics educator at Ancourage Academy, Gabriel sees the most common mistake: choosing subjects based on O-Level / SEC grades alone without considering university prerequisites. A student who scores A1 in Pure Chemistry but wants to study Business may not need H2 Chemistry — while a student aiming for Medicine absolutely does. This guide explains the system and provides a decision framework — the same framework our tutors apply in JC tuition programmes across H1 and H2 subjects.

How JC Subject Combinations Work

Every JC student takes four content subjects (three at H2 and one at H1, or four at H2), General Paper (H1), Project Work (pass/fail), and Mother Tongue (H1) unless exempted by at least a D7 in Higher Mother Tongue at O-Level / SEC (G3) — with the specific combination of content subjects forming the core of the A-Level certificate.

The standard structure:

3H2 + 1H1 combination: Three subjects at H2 (deeper study) and one at H1 (broader study). This is the most common configuration.
4H2 combination: Four subjects at H2. Offered only to high-performing students — published thresholds cluster around an L1R5 of 9-11 (a commonly published threshold — each JC sets its own criteria, and some add subject-specific grade conditions; these are L1R5 figures, and the JC admission aggregate becomes L1R4 from the 2028 PSE). More demanding, though under the 70-point UAS the fourth H2 counts only if it improves the score.
Compulsory subjects: General Paper (H1) and Project Work (pass/fail from the 2025 A-Level cohort onwards) are taken by all students. Mother Tongue Language (H1) is taken by all students except those who scored D7 or better in Higher Mother Tongue at O-Level, who are deemed to have met the requirement and are exempt from sitting it.
Contrasting subject: Every student must take at least one subject outside their primary stream — a Science stream student must take a Humanities/Arts subject, and vice versa.

The SEAB A-Level examination is the national assessment, but individual JCs may not offer every possible subject combination.

H1 vs H2: What the Levels Mean

H2 subjects cover the syllabus in greater depth and breadth than H1, and carry more weight in university admissions — but they also demand significantly more study time.

Feature	H1	H2
Depth of study	Foundational — covers core concepts	Comprehensive — covers core and extended content
Teaching hours	~4 hours/week	~6-8 hours/week
Exam papers	1 for most subjects; 2 for each science	2 for most subjects, 3 for a few (e.g. Knowledge and Inquiry), and 4 for each science
University Admission Score (UAS)	10 points max (grade A)	20 points max (grade A)
University prerequisites	Rarely accepted for course-specific requirements	Required for most competitive courses

The critical implication: under the revised 70-point University Admission Score (UAS) effective from the 2025 A-Level cohort, H2 subjects count double compared to H1. The UAS is computed as: 3 best H2 subjects (up to 20 points each = 60) + General Paper (up to 10 points) = 70 points maximum. Project Work is now graded pass/fail only and does not contribute to the UAS. A 4th content-based subject or Mother Tongue is included only if it improves the overall score, with the total rebased to 70. This makes the H1/H2 decision strategically important — every H2 subject carries significantly more weight.

Ancourage Academy's JC programmes support students across H1 and H2 subjects — book a trial class (usually $18) at Bishan or Woodlands, small groups of 3-6.

Science Stream Combinations and University Prerequisites

The four standard Science-stream combinations are H2 Chemistry–Biology–Mathematics (pre-Medicine), H2 Chemistry–Physics–Mathematics (Engineering and Computing), H2 Chemistry–Mathematics–Economics with H1 Physics (Science plus Business), and H2 Biology–Chemistry–Mathematics with H1 Geography (Life Sciences) — H2 Chemistry is the prerequisite that unlocks Medicine and Pharmacy, and H2 Mathematics the one that unlocks Engineering and Computing.

Common Science stream combinations (for subject depth, see our H2 Biology guide):

H2 Chemistry + H2 Biology + H2 Mathematics + H1 Economics: The classic pre-Medicine combination. NUS and NTU Medicine require H2 Chemistry plus either H2 Biology or H2 Physics.
H2 Chemistry + H2 Physics + H2 Mathematics + H1 Economics: The classic Engineering/Computing combination. H2 Mathematics is the universal engineering prerequisite; NTU additionally requires one of H2 Physics/Chemistry/Biology/Computing, and while NUS requires only H2 Mathematics, H2 Physics spares admitted students a bridging course.
H2 Chemistry + H2 Mathematics + H2 Economics + H1 Physics: A versatile combination for students who want to keep both Science and Business/Economics options open.
H2 Biology + H2 Chemistry + H2 Mathematics + H1 Geography: For Life Sciences and Pharmaceutical Sciences pathways.

Key university prerequisites to be aware of:

Medicine (NUS/NTU/LKCMed): H2 Chemistry + H2 Biology or H2 Physics
Engineering (most courses): H2 Mathematics (NUS lists nothing further in its central prerequisite table; NTU usually adds one of H2 Physics/Chemistry/Biology/Computing)
Computing/Computer Science: H2 Mathematics is the usual route, but NUS Computer Science also accepts an H2 pass in Computing, Further Mathematics or Physics, or a good pass in H1 Mathematics
Pharmacy: Very good H2 Chemistry + a very good pass in one of H2 Biology, H2 Physics, H2 Mathematics, or H2 Further Mathematics

Arts Stream Combinations and Career Pathways

The three common Arts-stream combinations are H2 Economics–History–English Literature with H1 Mathematics (Law, Political Science, Social Sciences), H2 Economics–Mathematics–Geography with H1 History (Business and Social Sciences), and H2 English Literature–History–Art with H1 Mathematics (humanities and creative fields) — none of the courses they lead to requires a specific Science subject, though NUS Law wants at least a B in H1 General Paper and NUS Business Administration at least an H1 pass in Mathematics.

Common Arts stream combinations (for subject depth, see our H2 Economics guide):

H2 Economics + H2 History + H2 English Literature + H1 Mathematics: Strong for Law, Political Science, and Social Sciences.
H2 Economics + H2 Mathematics + H2 Geography + H1 History: Versatile — keeps both Business and Social Sciences open. H2 Mathematics is highly valued by Business faculties.
H2 English Literature + H2 History + H2 Art + H1 Mathematics: For students passionate about the humanities and creative fields.

University pathways from Arts stream:

Law (NUS/SMU): No specific H2 subject is required, but both set a General Paper bar: NUS Law asks for at least a B grade in H1 GP (or an SAT Reading & Writing score of 700 with at least an E in GP), and SMU asks for a GP/KI grade of A or B. Both use a written selection test and/or interview, and NUS requires Law to be ranked as your first, second or third choice
Business (NUS/NTU/SMU): H1 Mathematics meets the minimum NUS BBA requirement, but H2 Mathematics is strongly advantageous for competitive admission and first-year coursework
Social Sciences: Any Arts combination is accepted; relevant H2 subjects (Geography, History, Economics) demonstrate interest

Hybrid Combinations: Mixing Science and Arts

Some students opt for hybrid combinations that span both streams — this provides flexibility but requires careful planning to ensure university prerequisites are still met.

A hybrid combination might look like: H2 Mathematics + H2 Economics + H2 Chemistry + H1 History. This keeps Engineering, Business, and some Science pathways open while including a Humanities component.

Advantages of hybrid combinations: broader exposure, flexible university options, and the ability to explore interests across disciplines. Disadvantages: may not meet prerequisites for highly specialised courses (e.g., Medicine requires two H2 Sciences), and some JCs may not offer the specific hybrid combination a student wants.

Students considering hybrid combinations should check their target JC's subject offering before committing — not all JCs support all possible combinations. Check each college's competitiveness too: our net L1R5 cut-off points for every JC show prior-year admission scores by stream. For a broader view of post-secondary options, see the JC vs Polytechnic comparison guide.

The Contrasting Subject Requirement

Every JC student must take at least one subject from outside their primary stream — this is the contrasting subject requirement, designed to ensure breadth in the A-Level education.

Science stream students must take at least one Humanities/Arts subject. The most common contrasting subject is H1 Economics or H1 Geography, taken at H1 level to minimise workload while satisfying the requirement.
Arts stream students must take at least one Mathematics/Science subject. H1 Mathematics is the most common choice. Some Arts students choose H2 Mathematics if they aim for Business or Economics at university.

The contrasting subject is often treated as a "lesser" subject by students. Under the 70-point UAS, only the 3 best H2 subjects and GP form the base score — but a 4th content subject (including the contrasting subject) is included if it improves the UAS. A strong contrasting subject grade can therefore boost the score, while a poor grade is simply excluded from the calculation.

Common Mistakes in JC Subject Selection

The three most costly mistakes in JC subject selection are: choosing based on O-Level grades without checking university prerequisites, taking 4H2 without the capacity to handle the workload, and choosing the contrasting subject carelessly.

Ignoring university prerequisites: A student who wants Medicine but does not take H2 Chemistry has closed that door permanently. Check prerequisites for your target courses before finalising subjects — not after. The secondary to JC transition guide covers this decision point.
Overloading with 4H2: Taking 4H2 is only advisable if the student meets the published threshold at their JC — typically an L1R5 around 9-11 (the JC admission aggregate becomes L1R4 from the 2028 PSE), with criteria set school by school — and has consistently strong performance across all subjects. A student who struggles to manage 4H2 will score lower overall than one who thrives with 3H2+1H1.
Neglecting the contrasting subject: Under the 70-point UAS, the 4th content subject is included only if it improves the score — but students aiming for competitive university courses benefit from every additional point. Treating H1 Economics or H1 Mathematics as an afterthought means missing out on a potential UAS boost.
Following friends rather than interests: Subject combinations should be chosen based on the individual student's strengths, interests, and university goals — not based on what their friends are taking.

At Ancourage Academy, students preparing for JC receive guidance on subject selection alongside academic tuition. The H2 Chemistry, H2 Mathematics, H2 Physics for Engineering-bound students, and General Paper programmes are designed to support students from JC1 through to the A-Level exam.

Book a trial class (usually $18) at Bishan or Woodlands — or WhatsApp Ancourage Academy to discuss JC subject selection or A-Level preparation.

What Are the Requirements for Each JC Subject Combination?

To take a subject at H2 in JC, most students need a strong O-Level / SEC grade in that subject — typically a B3 or better, with the sciences and H2 Mathematics often expecting an A. Beyond individual subject grades, three rules shape every valid combination:

Three H2 subjects plus General Paper form the core of nearly all combinations; a fourth content subject (taken at H1 or H2) completes it.
A contrasting subject is compulsory — Science-stream students take at least one Arts/Humanities subject and Arts-stream students take at least one Maths/Science subject. Knowledge and Inquiry is the exception: being multi-disciplinary, it counts as the contrasting subject for either stream.
Subject-specific prerequisites apply: H2 Physics and H2 Chemistry usually require the corresponding Pure science at O-Level / SEC; H2 Mathematics requires Additional Mathematics; H2 Economics and most Humanities have no prior-subject requirement but still expect a solid English grade.

Requirements vary slightly between junior colleges, so always confirm against your target JC's published combinations — and check each college's competitiveness using our JC cut-off points.

H1 vs H2 by Subject: Where the Gap Is Biggest

The jump from H1 to H2 is roughly double the syllabus in Mathematics, the Sciences and the Humanities alike — H2 History adds a second paper, H2 Geography two more content clusters, H2 Literature a whole elective paper — and smaller only in Economics, where H1 already covers the case-study core. Use this as a quick guide, then read the dedicated subject guides for the full breakdown:

Mathematics — H2 adds calculus, vectors, and statistics depth that H1 only samples. See the H2 Mathematics guide.
Chemistry and Physics — H2 is the full A-Level science with practical assessment; H1 is roughly half, with no practical. See the H2 Chemistry guide.
Economics — the H1-to-H2 gap is smaller: H2 adds the essay paper and macroeconomic depth on top of the H1 case-study core. See H2 Economics tuition.
Humanities — H1 History keeps the same case-study-plus-two-essays paper over the Cold War only; H1 Geography keeps two of H2's four clusters; H1 Literature keeps H2's Paper 1 with one unseen poem instead of two. See the H1 vs H2 humanities comparison for what each level actually drops.

Because each subject's gap is different, choose H2 where you need depth (or a prerequisite) and H1 where the subject is a supporting contrast.

Once the combination is settled, humanities marks are won on technique rather than coverage. We keep a separate guide for each paper: the H2 History source-based case study and H2 History essays, H2 Geography structured questions and H2 Geography essays, and H2 Literature unseen poetry alongside the set-text essay.

Common Questions About JC Subject Combinations

Can I change my subject combination after JC1?

Some JCs allow subject changes at the end of JC1, but this is subject to availability and the student's performance. Changing from H2 to H1 (e.g., dropping H2 Physics to H1 Physics) is more common and easier than switching subjects entirely. Changing from Arts to Science stream is very rarely permitted. It is much better to choose carefully from the start.

Is 4H2 worth it?

4H2 is worth it only if the student can maintain strong grades across all four H2 subjects. Under the 70-point UAS, the base score is the 3 best H2 subjects (20 points each) plus H1 General Paper (10 points); a fourth content subject — whether the 4th H2 or the H1 contrasting subject — and H1 Mother Tongue are each included only if they improve the score, after which the UAS is rebased to 70 points. Project Work is pass/fail and contributes no points, but a Pass in it is required for admission to the autonomous universities. A student who scores ABB/B with 3H2+1H1 will likely outscore one who manages BCC/C with 4H2. The additional H2 provides flexibility for university applications but only if the student can handle the workload without their grades suffering.

Is Chemistry compulsory in JC?

No. No content subject is compulsory in JC — only General Paper, Project Work and H1 Mother Tongue (unless exempted) are taken by everyone. H2 Chemistry is, however, the prerequisite that university courses ask for most often: NUS and NTU Medicine require an H2 pass in Chemistry with Biology or Physics, and NUS Pharmacy a very good pass in H2 Chemistry, so Science-stream students who want those doors open should treat it as compulsory in practice.

Which contrasting subject is easiest?

For Science stream students, H1 Economics and H1 Geography are the most commonly chosen contrasting subjects. Neither is objectively "easier" — H1 Economics suits students who enjoy logical reasoning and current affairs, while H1 Geography suits those who prefer spatial and environmental topics. Choose based on interest rather than perceived difficulty.

Do I need H2 Mathematics for Business at university?

NUS BBA officially requires only H1 Mathematics (or O-Level Additional Mathematics), not H2 Mathematics. However, H2 Mathematics is strongly advantageous for competitive admission and provides a significant head start in first-year university quantitative modules. NTU and SMU Business programmes similarly benefit from H2 Mathematics. If Business is a serious consideration, H2 Mathematics is the stronger choice even though it is not always a formal prerequisite.

What if I am unsure about my university course?

If undecided, choose a combination that keeps the most doors open. For Science stream: H2 Chemistry + H2 Mathematics + one other H2 Science. For Arts stream: H2 Economics + H2 Mathematics + one other H2 Humanities. H2 Mathematics is the single most versatile subject for university admissions across both streams.

Visit Ancourage Academy at Bishan or Woodlands, check JC courses, or WhatsApp us with any questions.

Ancourage Academy is a tuition centre in Singapore. This article may reference our programmes where relevant.

JC Subject Combination Guide: H1 vs H2, Science & Arts