How the grading scales work across England, Wales and Northern Ireland, how boundaries are set each year, and how to use them with past papers.
Grade boundaries are the minimum marks needed for each grade in an exam. They are set fresh for every subject in every exam series, which is why a score that earned a grade 6 one year might earn a 5 or a 7 another year. This guide explains how the grading scales work across the UK, how boundaries are decided, and how to use them sensibly when you practise with past papers.
GCSEs are not graded the same way everywhere in the UK, and international GCSEs have their own scales too.
| Qualification | Grades | Notes |
|---|---|---|
| GCSEs in England (AQA, Pearson Edexcel, OCR, Eduqas) | 9 to 1, plus U | 9 is the highest grade. Phased in from 2017. |
| GCSEs in Wales (WJEC) | A* to G, plus U | Wales kept letter grades. |
| GCSEs in Northern Ireland (CCEA) | A* to G, plus U, including C* | C* sits between B and C. |
| International GCSE and IGCSE | 9 to 1 or A* to G | Depends on the board and the version of the qualification. Check your entry. |
The 9 to 1 scale was designed with three fixed anchor points to the old letter grades:
Grade 9 was created to identify the very highest performers, so fewer students get a 9 than used to get an A*. Grades 8, 6, 5, 3 and 2 fill the gaps in between.
In England, the Department for Education describes grade 4 as a "standard pass" and grade 5 as a "strong pass". Students who do not achieve at least a grade 4 in English and maths are normally required to keep studying those subjects after 16. Many sixth forms and colleges set their own entry requirements, often asking for grade 5 or 6 in the subjects you want to take further, so check with them directly.
Boundaries are decided after the exams have been marked, not before. That is because papers vary slightly in difficulty from year to year, however carefully they are written. If one year's paper turns out harder, the boundaries are lowered so that students are not penalised; if it is easier, they rise.
In broad terms, the process combines:
Usually only the key boundaries (such as 7, 4 and 1 on the 9 to 1 scale) are set by judgement. The other boundaries are then worked out from these using set rules.
Subjects such as maths, the sciences and modern foreign languages are tiered. In 9 to 1 GCSEs, the foundation tier gives access to grades 1 to 5, and the higher tier to grades 4 to 9. On the higher tier there is also a safety net: a student who narrowly misses grade 4 can be awarded a 3. Below that, the result is U, so entering the right tier matters. Your teachers will usually decide this using your mock results.
For most GCSEs, the grade is based on your combined mark across all the papers in the subject, not on each paper separately. Boards sometimes publish "notional" boundaries for individual papers to give a sense of performance, but your final grade comes from the subject total. A weaker paper can be balanced out by a stronger one.
Each exam board publishes its grade boundaries on its own website, normally on results day for that series. They are listed by subject, specification code and tier. Make sure you match all three, because a boundary for a different tier or specification will give you a misleading answer.
The years 2020 and 2021 used teacher assessed grades rather than exams, so there are no normal grade boundaries for those series. In England, 2022 was a transition year with more generous grading, and grading returned to pre pandemic standards in 2023. Bear this in mind when comparing boundaries across years.
Converting a past paper score into a grade is a useful way to track progress, as long as you do it carefully:
For a full method for sitting and reviewing papers, see our guides to using past papers to revise and using mark schemes and examiner reports.
In England, grade 4 is described as a standard pass and grade 5 as a strong pass. In Wales and Northern Ireland, which use letter grades, grade C is broadly equivalent to a grade 4.
Exam papers vary slightly in difficulty from one year to the next. Boundaries are set after marking so that a grade represents the same standard of work regardless of whether that year's paper was harder or easier.
Exam boards normally publish grade boundaries on results day for each exam series, on their own websites.
Yes. Higher tier 9 to 1 GCSEs include an allowed grade 3 for students who narrowly miss grade 4. Below that, the result is U.
No. Grade 9 was designed to recognise the very highest performers, so fewer students achieve a 9 than used to achieve an A*. The bottom of grade 7 is aligned with the bottom of the old grade A.
Updated October 2026