CCEA A-level Chemistry grade boundaries 2025: raw marks by unit
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CCEA A-level Chemistry grade boundaries 2025 by unit
The figures are from CCEA's Raw to Uniform Mark Boundaries for GCE Chemistry, Summer 2025. The qualification has three AS units, 40% of the A-level, and three A2 units, 60%.
| Unit grade | AS 1 | AS 2 | AS 3 | A2 1 | A2 2 | A2 3 |
|---|---|---|---|---|---|---|
| Out of | 90 | 90 | 80 | 110 | 110 | 90 |
| a | 66 | 65 | 62 | 85 | 74 | 66 |
| b | 57 | 57 | 52 | 73 | 61 | 54 |
| c | 49 | 49 | 43 | 61 | 49 | 43 |
| d | 41 | 41 | 34 | 49 | 37 | 32 |
| e | 33 | 33 | 25 | 38 | 25 | 21 |
| Unit grade | AS 1 | AS 2 | AS 3 | A2 1 | A2 2 | A2 3 |
|---|---|---|---|---|---|---|
| Most you can earn | 96 | 96 | 48 | 144 | 144 | 72 |
| a | 77 | 77 | 39 | 116 | 116 | 58 |
| b | 68 | 68 | 34 | 101 | 101 | 51 |
| c | 58 | 58 | 29 | 87 | 87 | 44 |
| d | 48 | 48 | 24 | 72 | 72 | 36 |
| e | 39 | 39 | 20 | 58 | 58 | 29 |
Subject lines, AS and A-level
| Grade | AS, out of 240 | A-level, out of 600 |
|---|---|---|
| A | 192 | 480 |
| B | 168 | 420 |
| C | 144 | 360 |
| D | 120 | 300 |
| E | 96 | 240 |
A worked example from 2025
A candidate on the grade e raw boundary in all six units scored 33, 33, 25, 38, 25, 21. Those convert to 39 + 39 + 20 + 58 + 58 + 29 = 243 uniform marks, an E at 240. The AS part is 98, which would also be an AS grade E on its own (96 needed). Compare grade a: 66, 65, 62, 85, 74, 66, a total of 483.
Most raw boundaries rose in 2025
| Unit and grade | Summer 2024 | Summer 2025 | Change in last year |
|---|---|---|---|
| AS 1, grade a | 59 | 66 | +7 |
| AS 1, grade c | 43 | 49 | +6 |
| AS 2, grade a | 62 | 65 | +3 |
| AS 3, grade a | 61 | 62 | +1 |
| A2 1, grade a | 80 | 85 | +5 |
| A2 1, grade e | 32 | 38 | +6 |
| A2 2, grade a | 73 | 74 | +1 |
All six units had a higher grade a boundary in 2025 than in 2024. AS 1 rose seven, the biggest rise, and A2 1 rose five. AS 3, A2 2 and A2 3 each rose by only one. AS 3 grade e did not move at all, staying at 25. Taken together, the 2025 papers allowed candidates to collect more raw marks for the same uniform mark than the 2024 ones did. The pattern continued in 2026 for A2 1 and A2 2.
Reading the unit sizes
A2 1 and A2 2 are each marked out of 110 and worth 144 uniform marks. A grade a at 85 out of 110 on A2 1 is 77%. AS 1 is marked out of 90, and a grade a at 66 is 73%. The practical AS 3 is out of 80, with a grade a at 62 (78%). The high percentages show why a small number of lost marks can decide between an A and a B in this subject.
- Check the multiple-choice section carefully: each of the four written units includes 10 multiple-choice questions.
- AS 3 and A2 3 are practical units; revise the practicals you did in class.
- The CCEA Chemistry data sheet lists what you are given.
For a timed check, try today's Year 1 or Year 2 Chemistry paper, 8 questions worth 25 to 35 marks, written by us.
Common questions
What were the CCEA A-level Chemistry boundaries in 2025?
What was grade a in AS 1 Chemistry in 2025?
Did all the units rise in 2025?
How many marks is A2 1 Chemistry?
Is there a practical unit?
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UK · A-levelCCEA A-level Chemistry grade boundaries 2026: raw marksCCEA A-level Chemistry grade boundaries for Summer 2026: raw and uniform marks for all six units, the 600 mark lines and the A* rule.