What is a grade boundary?
A grade boundary is the minimum raw mark — the actual number of marks you score on the paper — required to achieve a particular grade. It is not a percentage target. It is not a fixed number. And it is not decided before you sit the exam.
For GCSE, boundaries are set on a scale of 1 to 9. For A-Level, they run from E to A*. For every subject and every exam board — AQA, Edexcel, OCR, WJEC — the boundaries are set separately, after all papers are marked.
Quick example
In AQA GCSE Maths Higher 2025, the grade 4 boundary was 63 marks out of 240. That means answering roughly 26% of the paper correctly was enough to pass. In English Language Higher, the grade 4 boundary was 84 out of 160 — about 53%. The subject changes everything.
Why do boundaries change every year?
The single biggest reason boundaries move is paper difficulty. If examiners write a harder paper than usual, students will score fewer marks — so the boundaries are lowered to compensate. If the paper is easier, students score more, and boundaries rise.
This system is overseen by Ofqual (in England) and Qualifications Wales. They use a process called comparable outcomes, which anchors the overall national grade distribution to prior attainment data from the same cohort. In plain terms: the percentage of students nationally who achieve a grade 7 in GCSE Maths should be broadly similar from year to year — not because boundaries are fixed, but because they are adjusted to reflect paper difficulty.
The key insight
A hard paper is not unfair — it just means the grade boundary will be lower. Ofqual's comparable outcomes process means that the proportion of students achieving each grade is protected from year-to-year swings in paper difficulty.
How boundaries are actually set: step by step
Papers are marked
Every student's paper is marked by examiners — either human markers or on-screen marking systems. This produces a raw score for each student.
Grade setting meeting
Senior examiners from the exam board meet to review the paper and a sample of student scripts. They make judgements about what standard of work represents a grade 4, 7, or A, etc.
Statistical modelling
The exam board runs prior attainment data for the cohort through statistical models. This tells them where boundaries should land to maintain comparable outcomes with previous years.
Boundaries are fixed
The final boundaries are agreed and locked. They are embargoed until Results Day — 8:00am — when they are published simultaneously for all schools and students.
Results are issued
Your raw mark is looked up against the boundary table for your specific paper and board. Your grade is determined at that moment — there is no human discretion applied to individual results.
Can boundaries be predicted in advance?
Not with precision — because the key variable (paper difficulty) cannot be known until after the exam. However, past boundary data gives you a useful working range. If AQA GCSE Maths Higher grade 7 has required between 155 and 175 marks out of 240 over the past five years, that range is a reasonable planning target for revision.
Statistical modelling — the kind exam boards themselves use — can narrow the range further by accounting for cohort attainment trends. GradesNova uses official published boundaries from the most recent year as the reference point for all calculators, updated the moment new data is released each Results Day.
For 2026, no one outside the exam boards knows the boundaries yet. They will be released at 8:00am on 21 August 2026 for GCSE and 13 August 2026 for A-Level.
Why do different exam boards have different boundaries for the same subject?
AQA, Edexcel, OCR, and WJEC all write their own papers and set their own boundaries independently. There is no coordination between boards on boundary levels. Because each paper is different in difficulty and structure, the raw marks required for each grade will differ — sometimes significantly.
This is why you should only ever use boundaries for the specific board your school uses. An Edexcel grade 9 boundary for Maths Higher applied to an AQA paper will give you a completely wrong estimate.
| Board | Grade 9 | Grade 4 | Max mark |
|---|---|---|---|
| AQA | 219 | 63 | 240 |
| Edexcel | 217 | 53 | 240 |
| OCR | 258 | 47 | 300 |
| WJEC | 196 | 27 | 240 |
GCSE Maths Higher tier, June 2025. Note: OCR uses 300 total marks across three papers.
How to use this knowledge in your revision
Use past boundaries as a target range
Look at 3–5 years of boundaries for your subject and board. The range tells you how much the paper can vary. Aim for the top of that range in your revision targets.
Think in raw marks, not percentages
Grade boundaries are always raw marks. Calculate how many marks you need per paper, not what percentage — the papers are different lengths.
Check your specific board
Your teacher will know which board your school uses. Only use boundaries for that board. Never mix AQA boundaries with an Edexcel paper.
Use the calculator on Results Day
As soon as official 2026 boundaries are published, enter your raw mark into GradesNova to see your exact grade — before opening any envelopes.
Check your mark now
Enter your raw mark into the GradesNova GCSE calculator to instantly see your grade based on the latest official 2025 boundaries for AQA, Edexcel, OCR and WJEC.
GCSE Grade Boundary Calculator →