IGCSE Chemistry (0620) grade boundaries — June 2025

Cambridge IGCSE (CAIE) (0620). The official grade thresholds for the June 2025 series — the minimum raw mark needed for each grade, by tier and paper combination. Pick the option matching the papers you sat.

Cambridge publishes these as grade threshold tables: "grade thresholds" and "grade boundaries" are two names for the same numbers.

June 2025 at a glance

A A* in Chemistry required 171/200 (86%) on extended · papers 21, 41, 51.
That A* threshold is 5 marks lower than March 2025 — slightly easier to achieve.
Across paper variants, the A* boundary ranged from 171 to 173 marks — variant choice mattered this session.
A grade C needed roughly 44% on extended · papers 21, 41, 51.

Extended · Papers 21, 41, 51

Grade	Min mark	Min %
A*	171	86%
A	143	72%
B	115	58%
C	88	44%
D	76	38%
E	65	33%
F	53	27%
G	41	21%

Maximum mark: 200.

Extended · Papers 22, 42, 52

Grade	Min mark	Min %
A*	172	86%
A	145	73%
B	116	58%
C	88	44%
D	77	39%
E	66	33%
F	54	27%
G	42	21%

Maximum mark: 200.

Extended · Papers 23, 43, 53

Grade	Min mark	Min %
A*	173	87%
A	146	73%
B	117	59%
C	88	44%
D	75	38%
E	63	32%
F	52	26%
G	41	21%

Maximum mark: 200.

Extended · Papers 21, 41, 61

Grade	Min mark	Min %
A*	172	86%
A	145	73%
B	116	58%
C	88	44%
D	76	38%
E	65	33%
F	54	27%
G	43	22%

Maximum mark: 200.

Extended · Papers 22, 42, 62

Grade	Min mark	Min %
A*	173	87%
A	146	73%
B	117	59%
C	89	45%
D	78	39%
E	67	34%
F	55	28%
G	43	22%

Maximum mark: 200.

Extended · Papers 23, 43, 63

Grade	Min mark	Min %
A*	173	87%
A	147	74%
B	118	59%
C	89	45%
D	77	39%
E	66	33%
F	55	28%
G	44	22%

Maximum mark: 200.

Core · Papers 11, 31, 51

Grade	Min mark	Min %
C	106	53%
D	88	44%
E	71	36%
F	53	27%
G	35	18%

Maximum mark: 200.

Core · Papers 12, 32, 52

Grade	Min mark	Min %
C	109	55%
D	93	47%
E	78	39%
F	61	31%
G	44	22%

Maximum mark: 200.

Core · Papers 13, 33, 53

Grade	Min mark	Min %
C	110	56%
D	92	46%
E	74	37%
F	56	29%
G	38	19%

Maximum mark: 200.

Core · Papers 11, 31, 61

Grade	Min mark	Min %
C	106	53%
D	88	44%
E	71	36%
F	54	27%
G	37	19%

Maximum mark: 200.

Core · Papers 12, 32, 62

Grade	Min mark	Min %
C	110	56%
D	94	47%
E	79	40%
F	62	31%
G	45	23%

Maximum mark: 200.

Core · Papers 13, 33, 63

Grade	Min mark	Min %
C	111	56%
D	94	47%
E	77	39%
F	59	30%
G	41	21%

Maximum mark: 200.

Calculate your Chemistry grade →

Official source (PDF) →

Figures sourced from the official Cambridge grade threshold tables. Always confirm with your exam board.