GCSE vs IGCSE: What Is the Difference?

A GCSE and an IGCSE are both sat at the end of Year 11 and both are accepted by UK sixth forms and universities. The differences that matter are grading and accountability: Cambridge IGCSEs are graded A* to G around the world, with a 9 to 1 option available only in one administrative zone, Pearson Edexcel International GCSEs are all graded 9 to 1, and Cambridge states that neither version of its qualification counts in UK school performance tables.

Is an IGCSE Graded 9 to 1 or A* to G?

Both, depending on the board and on a decision the school makes. This is the question most families arrive with and it is answered wrongly almost everywhere, because the two international boards behave differently.

Cambridge is explicit: Cambridge IGCSEs are graded A* to G around the world, and that system is well understood and widely recognised by universities internationally. Since schools in England began introducing 9 to 1 grading for GCSEs in June 2017, Cambridge has offered 9 to 1 graded IGCSEs in administrative zone 3, and schools there choose between the two. All schools can maintain A* to G grading.

Pearson has no such split. Its International GCSEs are awarded on the nine-point scale, which it describes as introduced by the UK government to raise standards and recognise top-performing students, and which it says is used for over 5 million GCSEs and International GCSEs.

The practical consequence is worth being blunt about. A pupil at an English independent school can receive an A* to G Cambridge IGCSE, a 9 to 1 Cambridge IGCSE, or a 9 to 1 Pearson Edexcel International GCSE in the same subject in the same summer. Which one arrives on the results slip is an entry decision taken by the school, not a statement about the pupil.

The Entry Decision That Cannot Be Undone

Cambridge publishes one operational rule that no other page on this subject carries, and it is the one with a consequence attached. Once an entry has been made for a syllabus on either grading scale, the candidate cannot be moved to the other scale after the entries deadline has passed. An entry made on the wrong scale has to be withdrawn and re-entered before that deadline, or it stands.

For a parent, that turns a piece of trivia into a question worth asking. If your child's school offers Cambridge IGCSEs, which scale has it entered them on, and does the whole year group get the same one? A pupil who moves school mid-course, or who is entered privately, can end up on a different scale from the classmates they revise with, and the grade boundaries and reporting will not line up.

It also matters for anyone comparing results across a cohort. Two children in the same year at the same school, one entered on A* to G and one on 9 to 1, hold qualifications that convert to one another but do not read the same way on a sixth-form application form.

Do IGCSEs Count in School Performance Tables?

No, and Cambridge says so in a single sentence: neither the 9 to 1 nor the A* to G versions of its syllabuses are included in UK performance tables.

That one line explains most of the pattern families notice. State schools are measured on Progress 8 and Attainment 8, which are built from qualifications that count in the tables, so a state school entering pupils for IGCSEs would be scoring nothing for that subject however well the pupils did. Independent schools are not measured that way, which is why the IGCSE is common in the independent sector and rare outside it.

It is important to be precise about what this does and does not mean. It is an accountability rule about how schools are measured. It is not a statement about the standing of the qualification with sixth forms, colleges or universities, all of which accept both, and it says nothing about difficulty.

Is an IGCSE Harder or Easier Than a GCSE?

Neither board claims an advantage, and both make an explicit standards claim that is worth quoting rather than adjudicating.

Cambridge states that it aligns the standards of Cambridge IGCSE with the GCSE qualification taken in England. Pearson states that moving to the 9 to 1 grading scale ensures the International GCSE is most closely aligned to the British curriculum and meets the same standards as Ofqual sets in the UK, so that students can progress to A level, International A level and university.

What that leaves is a per-subject question rather than a general one. Content, assessment structure and the weight given to practical or spoken components differ syllabus by syllabus, and a difference that is real in one subject may not exist in another. The reliable comparison is between two specification documents, not between two acronyms — and that is a comparison the school has already made on the pupil's behalf.

Where a genuine, generalisable difference does show up is in assessment shape. International specifications lean more heavily on terminal written examinations, partly because they are designed to be delivered in centres worldwide where controlled assessment is harder to standardise. A child who performs well in a single written examination and less well over a course of assessed work may find that suits them. The reverse is equally true, and neither is a statement about rigour.

Which One Should Your Child Take?

For a child sitting in the summer 2027 series and applying for 2027 entry to a sixth form, the question usually does not arise, because the school has decided. State schools in England enter pupils for GCSEs almost exclusively; independent schools choose per subject, and often use a mixture, entering IGCSE in some subjects and GCSE in others depending on which specification the department prefers.

Where a choice genuinely exists — a move between schools, a private candidate, distance learning, or a family relocating — three questions settle it. First, where will the child sit A levels or an equivalent, and does that institution have a stated preference? Almost none do, but ask rather than assume. Second, does the child need the qualification to count in a school's performance figures? If the school is a state school in England, then yes, and the IGCSE will not. Third, which assessment shape suits the child?

What should not drive the decision is a belief that one is easier. Both boards make the same standards claim, both sit at the same point in the school career, and both feed the same next step. Our GCSE tuition pages cover the English specifications, and the GCSE Maths, Biology and English pages set out what each one assesses.

What Does a Real Specification Comparison Look Like?

“Compare the two specifications” is easy advice to give and harder to act on, so here is what the exercise involves, using the English GCSE side as the worked example.

AQA's GCSE Mathematics is tiered: a Foundation tier covering grades 1 to 5 and a Higher tier covering grades 4 to 9, and a student must sit all three papers at the same tier and in the same series. Each paper is 1 hour 30 minutes and carries 80 marks, and each is worth 33 % of the qualification. Paper 1 is non-calculator; papers 2 and 3 allow a calculator.

Those five facts — tier structure, number of papers, duration, marks and calculator rules — are what you line up against the international specification for the same subject, and they are published for both. Pearson states that its International GCSE Mathematics A is comparable to the UK reformed GCSEs in terms of the level of demand and assessment standards, and the specification document sets out its own paper structure in the same terms.

Two things usually emerge from doing this properly. The first is that tiering is not universal: where an English GCSE forces a Foundation or Higher decision that caps the achievable grade at 5, an international specification in the same subject may be untiered, which changes what a borderline student is playing for. The second is that the calculator rules differ, and a child who has practised entirely with a calculator on a specification that has a non-calculator paper is under-prepared in a way no amount of content revision fixes.

Neither of those is a reason to prefer one qualification. They are reasons to know which one your child is actually entered for before deciding how to prepare.

What This Means for Tuition

The practical point for anyone arranging support is that the qualification name is not enough information. “IGCSE Biology” could be Cambridge on A* to G, Cambridge on 9 to 1 or Pearson Edexcel on 9 to 1, and those are three different specifications with different content lists, different paper structures and different mark schemes.

Before any tuition starts, get three things from the school: the board, the syllabus or specification code, and the tier of entry where the subject is tiered. Those three pieces of information determine what should be taught and what past material is usable. Work pitched at the wrong specification is not obviously wasted — it looks like productive revision — which is exactly what makes it expensive.

Reviewed August 2026: the grading scales, the administrative-zone rule, the entries-deadline rule, the performance-table position and both boards' standards claims checked against Cambridge International's and Pearson's own published pages. Subject-level content differences are set syllabus by syllabus and are not generalised here; compare the two specification documents for the subject in question.

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