Short answer: many Cambridge IGCSE subjects are offered at two paper tiers — Core and Extended. The tier your child is entered for sets the highest grade they can possibly receive. On Core, the ceiling is a C. A student who answers every question correctly on Core papers still cannot be awarded a B or an A. Most parents discover this on results day.
What the two tiers actually are
Tiering is not streaming by class or by teacher. It is a decision about which exam papers your child sits, made by the school and submitted to the exam board at entry.
| Tier | Grades available | Intended for |
|---|---|---|
| Core | C · D · E · F · G | Students expected to achieve in the C–G range |
| Extended | A* · A · B · C · D · E | Students expected to achieve in the A*–E range |
The three grades in the middle — C, D and E — appear on both tiers. Cambridge describes that overlap as deliberate: it exists to accommodate students who perform better or worse than their teachers expected.
Not every subject is tiered. It applies to a subset that includes Mathematics and the sciences. Which of your child's subjects are tiered is a question for the school, not something to assume.
Why this matters more than it sounds
Two consequences follow, and the second is the one that costs families.
One: the ceiling is fixed before the exam. Effort in the final months cannot lift a Core entry above a C. The work still matters — a C rather than an E changes options — but the top of the range is closed.
Two: A Level entry requirements are usually written in grades the Core tier cannot reach. Sixth forms commonly ask for a grade 6/B or higher in the subject a student wants to continue at A Level, and often a specific grade in Maths and English regardless of subject choice. A student on Core in Maths can finish Year 11 having done well by their own tier and still be short of the entry grade for the A Level they had planned.
This is the mechanism behind a pattern we see every year: a family is satisfied with progress all the way through Year 10 and Year 11, and only in the sixth-form application does the ceiling become visible.
Why parents new to the British system find out late
Three reasons, none of them anyone acting badly:
- School reports rarely name the tier. They show percentages and predicted grades. A predicted C reads as a solid pass; it does not announce that C is the maximum.
- The entry decision is administrative. It is made at entry deadlines, months before the exam, and is often not communicated as a decision at all.
- Families arriving from other systems have no reference point. Parents who did not sit IGCSEs themselves have no reason to know tiering exists — there is no equivalent in most national systems in the region.
Four questions to ask the school — in writing
- Which of my child's subjects are tiered, and which tier are they currently entered for in each?
- What is the highest grade attainable in each of those entries?
- What is the deadline for changing a tier, and what evidence would the school need to change it?
- Which exam board is each subject entered with? Cambridge and Edexcel structure the same subject differently, and past-paper practice is only useful if it matches the right board.
Ask by email rather than at a parents' evening. A written answer gives you a date, a named tier per subject, and something to refer back to.
When Core is the right call
Core is not a lesser option — it is a different one, and for some students it is the better one.
Extended papers are longer and harder, and a student placed on Extended before they are ready can end up with a D or an E where Core would have produced a secure C. A C on Core is worth more than a near-miss on Extended, both as a grade and as an experience.
Core is likely the right tier when the student is consistently below the Extended threshold in class assessments, when the subject is not required for their intended A Level path, or when they are carrying a heavy subject load and need one subject to be secure rather than ambitious.
The problem is not Core. The problem is Core by default, in a subject the student needs at A Level, without the family knowing.
If the tier needs to change
Tier changes are possible up to the board's entry amendment deadline, and schools will usually want evidence — typically performance on Extended-standard past papers under timed conditions, not a request on its own.
That means the useful sequence is: establish the current standard against Extended papers, close the specific gaps, then present the result. A term is usually enough for one subject if the gap is in technique rather than in foundations. If the gap is in foundations — algebra underneath the Maths, or reading speed underneath the sciences — it takes longer, which is why finding out early matters so much.
Frequently asked questions
Can my child be on Extended for one subject and Core for another?
Yes. Tiering is decided subject by subject, so a student may sit Extended Maths and Core Physics. Ask for the tier of each tiered subject separately.
Does the certificate show which tier was taken?
Universities and sixth forms read the grade. What matters practically is that a Core entry cannot produce a grade above C, so a requirement written as a B or above cannot be met from that tier.
Is Extended always better for university applications?
No. What helps an application is the grade actually achieved in the subjects the course requires. An A on Extended helps; a D on Extended does not help more than a C on Core.
My child is in Year 10 — is it too early to worry about this?
Year 10 is the right time. It is when the gap between current standard and Extended standard is still closable, and before the entry deadline makes the decision for you.
How do I know if the gap is technique or foundations?
Give them one complete Extended past paper under timed conditions. If they understand the questions but run out of time or lose marks on method, it is technique. If earlier-year content blocks them from starting, it is foundations — a different and longer piece of work.
What to do this week
Email the school with the four questions above. You will have a clear answer within a few days, and either reassurance or several months of warning — both are better than finding out in August.
If the answer shows a tier that does not match where your child is heading, the next step is to measure the real gap against Extended-standard papers. Message us on WhatsApp for a free level assessment — we will tell you whether it is a term of work or a year, including when the honest answer is that Core is the right tier to stay on.
Related reading: British curriculum tutoring in the UAE · IB vs IGCSE · British vs American curriculum · IB vs A Level · Flex tutoring packages · All subjects
Last updated: 22 September 2026. Tier grade ranges and the Core grade ceiling are as published by Cambridge International. Which subjects are tiered, entry deadlines and amendment rules vary by subject, board and school — confirm each with your child's school directly.
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