IB vs A-Levels — What's the Difference and Which Is Right for Your Child?

If you're a parent trying to decide between the IB Diploma and A-Levels for your child, you've probably already discovered that there's a lot of information out there. This is a straightforward comparison from someone who has taught and examined across both systems.

The basics

The International Baccalaureate Diploma Programme (IBDP) and A-Levels are both internationally recognised pre-university qualifications, typically taken between the ages of 16 and 18. Both are accepted by universities around the world, including the most competitive institutions in the UK, US, Singapore, and beyond.

The similarities largely end there.

Breadth vs depth

The most fundamental difference between the two systems is this: the IB is broad, and A-Levels are deep.

IB students study six subjects simultaneously — typically three at Higher Level and three at Standard Level — spanning languages, humanities, sciences, mathematics, and the arts. No matter what your child's strengths are, they will study subjects outside their comfort zone for two years.

The Singapore-Cambridge GCE A-Level system is a two-year pre-university curriculum. Students typically take three H2 and one H1 content subjects, plus mandatory H1 General Paper, Project Work, and Mother Tongue. A student who loves mathematics and sciences can focus almost entirely on those subjects.

Neither approach is better in absolute terms. They suit different kinds of learners.

The IB core requirements

Beyond the six subjects, the IB Diploma requires every student to complete three additional components that have no equivalent in A-Levels:

Theory of Knowledge (TOK) — a course that asks students to reflect on the nature of knowledge itself. How do we know what we know? What are the limits of different ways of knowing? TOK culminates in an essay and a presentation, both of which are assessed.

Extended Essay (EE) — an independent research paper of up to 4,000 words on a topic of the student's choosing. It is the closest thing to undergraduate research that most secondary students will experience.

Creativity, Activity, Service (CAS) — a programme of extracurricular engagement that runs throughout the two years. Students must demonstrate meaningful participation across all three areas and reflect on what they have learned.

These three components add significant workload to the IB, but they also develop skills — independent research, critical thinking, sustained commitment — that A-Levels do not formally assess.

Assessment

A-Levels are assessed almost entirely through final examinations at the end of the two-year course. Coursework exists in some subjects but is not a universal feature of the system.

The IB uses a combination of internal assessment and external examination. Internal assessments are completed during the course and marked by teachers, then moderated by the IB. They contribute to the final grade in every subject.

This means IB students are being assessed continuously throughout their two years, not just at the end. For some students this is a strength — it rewards consistent effort over time. For others it adds pressure that doesn't let up.

Grading

Singapore-Cambridge A-Levels

A-Levels use letter grades — A, B, C, D, E, S, and U. Each grade corresponds to rank points used to calculate the University Admission Score (UAS) for Singapore university applications. An A in an H2 subject is worth 20 rank points, a B is 17.5, and so on.

Important update for 2026: Starting from 2026, the maximum UAS drops from 90 to 70 rank points. The UAS will be computed based on General Paper and three H2 subjects only. Project Work will be graded as Pass/Fail and no longer contributes to rank points. For a full explanation, read our detailed guide to the 2026 A-Level scoring changes.

IB

The IB uses a points system. Each subject is graded from 1 to 7, and the three core components contribute up to 3 additional points, giving a maximum total score of 45. Competitive courses at top universities typically require 38 to 42 points or above.

Workload

Both systems are demanding. But the IB's breadth — combined with continuous internal assessment, the Extended Essay, and TOK — means the total workload is generally higher. Students are managing six subjects plus the core requirements simultaneously.

IB students consistently report that time management is one of the biggest challenges of the programme. The Extended Essay, TOK, and CAS do not pause while exam season approaches — they run concurrently with everything else.

University recognition

Both qualifications are widely accepted by universities globally. For UK universities, A-Levels remain the most familiar qualification, but the IB is well understood and respected. For US universities, the IB is often viewed favourably because it demonstrates breadth, independent research through the Extended Essay, and a well-rounded profile. For Singapore autonomous universities, both qualifications are accepted, with specific grade or points requirements for each course.

Which system suits which student?

The IB tends to suit students who:

• Are genuinely curious across multiple subjects, not just their specialist areas
• Are strong writers and communicators as well as analytical thinkers
• Are self-motivated and can manage their time independently over a sustained period
• Are considering universities in the US, Canada, or countries beyond the UK and Singapore

A-Levels tend to suit students who:

• Have a clear idea of their intended university subject and want to focus on it deeply
• Perform better under a traditional examination model than continuous assessment
• Prefer to develop mastery in a small number of subjects rather than competency across many
• Are applying primarily to Singapore and UK universities

A note for parents in Singapore

Singapore has a strong tradition of both pathways. Many international schools offer the IB, while others offer A-Levels. The right choice depends on your child's strengths, their university ambitions, and the school environment in which they will thrive.

If your child is already in an IB school and heading into the Diploma Programme, the decision has largely been made. The most useful thing at that point is understanding the system well enough to support them through it — and making sure they have the right resources for the subjects they find most challenging.