IGCSE Grade Boundaries
Raw marks in, grades out, and the four rules that decide where the line falls this series.
Raw marks, not percentages
Each paper has a fixed mark total. Your grade comes from the total raw mark across your papers compared against that series boundaries, so percentages are only ever a rough guide.
Boundaries move each series
A harder paper needs fewer marks for the same grade. Awarding bodies adjust after every sitting to keep a grade meaning the same standard across years.
Tier ceilings are absolute
Core caps below the top grade, and Extended or Higher opens it. No amount of Core marks buys a grade the tier does not offer.
Boundaries are set after results
You will not know your grade boundary before the exam. Targets built from several past series give the honest range to aim for.
How the two syllabi differ
Cambridge IGCSE Mathematics (0580) / Cambridge IGCSE (9–1) Mathematics (0980)
0580 is graded A*–G; 0980 is graded 9–1. Both use the same subject content. Tiers: Core and Extended. Every tier publishes its own boundary table per series, so always compare your total against the table for your tier and your exact paper combination.
Edexcel International GCSE Mathematics A (4MA1)
Graded 9–1 on the nine-grade scale. Tiers: Foundation and Higher. Every tier publishes its own boundary table per series, so always compare your total against the table for your tier and your exact paper combination.
A worked reading example
Illustrative only, with hypothetical numbers. Real boundaries come from the official threshold table for your series.
Suppose a candidate totals 142 marks out of 200, which is 71%. The threshold table for that series might list the grade 7 boundary at 140 and grade 8 at 155. The candidate lands just inside grade 7. In a different series with an easier paper, the grade 7 boundary might sit at 150, and the same 142 would fall below it. The percentage did not change; the standard the paper demanded did.
This is exactly why targets use several series of boundaries, not one.
What to do about it
- ✓Download threshold tables from at least three past series for your tier and note the range for each grade.
- ✓Score your practice papers out of the real total, then place each score inside those ranges.
- ✓Aim for the top of the range, not the boundary. Exam-day variation of a few marks is normal.
- ✓Revisit tier choice at every report card. A student hovering at the Extended boundary may gain by securing Core first, and a strong Core student should move up early.
For the full paper structure behind these totals, see the IGCSE Math hub.
More IGCSE guides
IGCSE Algebra →
Equations, identities, sequences, graphs and the algebra skills both syllabi assess most
IGCSE Geometry →
Shapes, mensuration, transformations and vectors, from Core basics to Extended proofs
IGCSE Trigonometry →
Trig ratios, bearings, 3D problems and the sine and cosine rules on Higher/Extended papers
IGCSE Statistics & Probability →
Averages, charts, cumulative frequency, histograms and probability, including set notation
IGCSE Maths Revision Plan →
A term-by-term revision timetable that adapts to Core, Extended, Foundation or Higher entry
IGCSE Past Papers →
Where to find official past papers and how to turn them into a marking-backed study loop
IGCSE vs O-Level →
Recognition, syllabus and entry differences between IGCSE and GCE O-Levels
IGCSE Math Tuition →
What to evaluate in an IGCSE maths tutor, and how adaptive practice compares
← Back to the IGCSE Math hub
Syllabus comparison, tier decisions and grade guides in one place
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