IGCSE grades explained: what parents actually need to know

Two scales, one qualification

Depending on the school and the exam board, your child's IGCSE results arrive on the 9 to 1 scale, the A* to G scale, or a mix across subjects. The 9 to 1 scale is the newer one: 9 sits above the old A*, 4 is the standard pass, and 5 is the strong pass many sixth forms use in offers. On the letter scale, C is the traditional pass benchmark.

Neither scale is harder than the other. They are different rulers for the same performance, and universities and sixth forms know how to read both. What matters is the specific grades your child's next school or programme asks for, which is worth confirming in writing rather than assuming.

Tiers decide the ceiling before the exam starts

In tiered subjects, most importantly maths and the sciences, schools enter each student for either the Core or Extended tier (Foundation or Higher on some boards). The lower tier caps the achievable grade regardless of performance on the day. A student who finds the Core paper easy cannot score above the cap.

Schools usually place students sensibly, but the decision is often made earlier than parents realise, sometimes on class data from the year before. If your child is borderline and aiming at a sixth form with specific grade requirements, ask the school which tier they plan to enter and when that decision locks. An independent read from a tutor who has seen your child's written work is useful evidence in that conversation.

Grade boundaries move, and that is normal

Every exam session, the boards set fresh grade boundaries so that a grade reflects the same standard even when a paper runs harder or easier than usual. This is why comparing raw marks across years misleads, and why practicing against last year's boundaries gives only a rough guide. Tutors use boundaries as a compass, not a promise: consistently landing ten marks above last session's boundary is meaningful, scraping two above it is not.

If results day disappoints

There are more options than most families realise. Papers can be reviewed and remarked, and marks do change, most often in essay-based subjects. Retakes are available in a later session, and for IGCSE that can mean a November sitting rather than waiting a full year. A targeted retake of one or two subjects, prepared properly, is routine rather than remarkable.

The useful move on results day is diagnostic, not emotional: request the breakdown, find which papers underperformed, and decide with real information. A disappointing grade with a clear cause is a plan; a disappointing grade with no investigation is just a bad day.