If you are choosing a school or planning your exams, you will quickly meet two names: Cambridge O Level and Cambridge IGCSE. Both are run by Cambridge International, both are taken at the end of Grade 10 (around age 16), and both lead straight into A Level. So what actually changes?
The short comparison
| Cambridge O Level | Cambridge IGCSE | |
|---|---|---|
| Level | Secondary, age 14–16 | Secondary, age 14–16 |
| Grading | A* to E | A* to G, or 9 to 1 in some centres |
| Tiers | One paper set for everyone | Core and Extended in many subjects |
| Where it's offered | Mainly Pakistan, Bangladesh, Sri Lanka and parts of Africa | Worldwide |
| Coursework options | Few | More subjects offer coursework or practical alternatives |
| University recognition | Equivalent | Equivalent |
Grading: A*–E vs A*–G
O Level grades run from A* to E. IGCSE grades run from A* to G, and some centres use the numbered 9–1 scale instead, where 9 is the highest. A grade C or above (or 4 and above on the 9–1 scale) is generally treated as a pass for A Level entry.
Core and Extended papers
This is the difference that matters most for day-to-day study. In subjects like Mathematics and the sciences, IGCSE offers two tiers:
- Core: a smaller syllabus and easier papers. The highest grade available is C.
- Extended: the full syllabus, with grades A* to E available.
O Level has no tiers: every student sits the same papers, and the content is roughly the same as IGCSE Extended. If you are aiming for A or A*, you will be studying Extended-level material either way. We explain the choice in detail in our guide to IGCSE Maths Core vs Extended.
Syllabus content
The subject content overlaps heavily. O Level Chemistry (5070) and IGCSE Chemistry (0620), for example, cover the same core topics: atomic structure, bonding, stoichiometry, electrochemistry, energetics, rates, acids and bases, and organic chemistry. The differences are in question style, paper structure and a handful of topics, which is why a teacher who knows the exact syllabus code matters.
Which one should you choose?
- Your school decides for you: most students simply take what their school offers. That is fine; both routes are respected.
- Private candidates in Pakistan: O Level is the more common route, with exams in the May/June and October/November series through the British Council.
- Families who may move abroad: IGCSE is recognised everywhere and easier to continue in another country.
- Students who need a gentler route in one subject: IGCSE Core lets a student secure a pass without the full syllabus.
How we teach both
Our teachers work to the exact syllabus code for each student, so an O Level student practises O Level-style questions and an IGCSE student practises the right tier. See our O Level course and IGCSE course for subjects, fees and class options.
Frequently asked questions
01Is IGCSE harder than O Level?
Not in general. The content and standard are very similar. IGCSE Extended papers are close to O Level in difficulty, while IGCSE Core papers are easier but cap the top grade at C.
02Do universities accept O Level and IGCSE equally?
Yes. Universities in the UK, US, Canada, the Middle East and Pakistan treat Cambridge O Level and IGCSE as equivalent qualifications. Students applying in Pakistan also need an IBCC equivalence certificate.
03Can I mix O Level and IGCSE subjects?
Yes. Many schools let students take some subjects at O Level and others at IGCSE, and the grades count together for A Level entry and university applications.
