WJEC A-level Chemistry grade boundaries 2025: what each unit needed
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WJEC A-level Chemistry grade boundaries June 2025
The first table is the part WJEC never changes: how many uniform marks a unit grade is worth. Units 1 and 2 are out of 100, Units 3 and 4 out of 125 and the practical, Unit 5, out of 50, so an overall A is 400 of 500. The specification gives the units their titles, from The Language of Chemistry to Organic Chemistry and Analysis.
| Unit | A | B | C | D | E |
|---|---|---|---|---|---|
| Chemistry AS Unit 1 | 80 | 70 | 60 | 50 | 40 |
| Chemistry AS Unit 2 | 80 | 70 | 60 | 50 | 40 |
| Chemistry A2 Unit 3 | 100 | 88 | 75 | 63 | 50 |
| Chemistry A2 Unit 4 | 100 | 88 | 75 | 63 | 50 |
| Chemistry A2 Unit 5 | 40 | 35 | 30 | 25 | 20 |
Raw marks per unit, 2025
The table below is the 2025 conversion from the grade converter, with 2026 compared in the last column.
| Unit | A, 2025 | B | C | D | E | A, change on 2026 |
|---|---|---|---|---|---|---|
| AS Unit 1 | 49 | 41 | 33 | 25 | 18 | −1 |
| AS Unit 2 | 49 | 41 | 33 | 25 | 18 | +1 |
| A2 Unit 3 | 49 | 41 | 33 | 25 | 18 | +10 |
| A2 Unit 4 | 52 | 44 | 36 | 28 | 21 | +1 |
| A2 Unit 5 | 43 | 36 | 30 | 24 | 18 | +2 |
Adding up a candidate
Suppose raw marks of 38, 36, 44, 40 and 32 in Units 1 to 5. The converter gives 66, 64, 93, 82, 32, and the total is 337. The grade is a C, 37 above the line at 300 and 13 short of B at 350. The A2 units supply 207, which is no use for an A*.
The identical boundaries
It is rare for three units to share one raw boundary. In 2025 Units 1, 2 and 3 all show 49, 41, 33, 25 and 18 for A to E on WJEC's converter. This is what the board published, so copy it as it stands and do not assume the papers were the same. In 2026 the same units had separate boundaries again.
Senedd Research reports 10.5% of A level entries in Wales at A* in 2025 and 97.5% at A* to E.
The practical shows how little room there is at the top. An A in Unit 5 needed 43 raw marks for 40 uniform marks and an E needed 18 for 20, so every raw mark there is worth about 0.8 uniform marks. In the written units a raw mark is worth between 1 and 2 uniform marks, which is why the practical looks forgiving but moves the total less.
What the 2025 table says
- Unit 4 was the demanding one. An A needed 52 raw marks, the most in Chemistry.
- The practical needed 43 for an A. That is high for a unit worth 50 uniform marks.
- E was 18 in four units. That is a quick way to remember the pass line.
Use a daily paper as a check
The A-level Chemistry Year 1 and Year 2 papers have 8 questions and 25 to 35 marks. They are written by us and are not WJEC's. Turn your mark into a share and compare it with 80% for an A and 40% for an E, as a rough guide.
Common questions
What were the WJEC A-level Chemistry boundaries in 2025?
What raw mark was an A in Chemistry Unit 4 in 2025?
What raw mark was an E in Unit 2 in 2025?
When were the 2025 results issued?
Revision cards
Cover the back, say it, flip.
Where to go next
- Test it
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UK · A-levelWJEC A-level Chemistry grade boundaries 2026WJEC A-level Chemistry 2026 boundaries: raw marks for each of the five units, the fixed UMS totals, the A* rule and what changed since 2025.