IGCSE Combined Science (0653) grade boundaries — November 2025

Cambridge IGCSE (CAIE) (0653). The official grade thresholds for the November 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.

November 2025 at a glance

A A* in Combined Science required 151/200 (76%) on extended · papers 21, 41, 51.
That A* threshold is 7 marks higher than June 2025 — slightly harder to achieve.
Across paper variants, the A* boundary ranged from 150 to 152 marks — variant choice mattered this session.
A grade C needed roughly 40% on extended · papers 21, 41, 51.

Extended · Papers 21, 41, 51

Grade	Min mark	Min %
A*	151	76%
A	127	64%
B	103	52%
C	80	40%
D	70	35%
E	60	30%
F	50	25%
G	40	20%

Maximum mark: 200.

Extended · Papers 22, 42, 52

Grade	Min mark	Min %
A*	151	76%
A	125	63%
B	99	50%
C	74	37%
D	64	32%
E	54	27%
F	45	23%
G	36	18%

Maximum mark: 200.

Extended · Papers 21, 41, 61

Grade	Min mark	Min %
A*	152	76%
A	128	64%
B	104	52%
C	80	40%
D	70	35%
E	60	30%
F	50	25%
G	40	20%

Maximum mark: 200.

Extended · Papers 22, 42, 62

Grade	Min mark	Min %
A*	150	75%
A	125	63%
B	100	50%
C	75	38%
D	64	32%
E	54	27%
F	45	23%
G	36	18%

Maximum mark: 200.

Extended · Papers 23, 43, 63

Grade	Min mark	Min %
A*	150	75%
A	126	63%
B	102	51%
C	78	39%
D	68	34%
E	58	29%
F	48	24%
G	38	19%

Maximum mark: 200.

Core · Papers 11, 31, 51

Grade	Min mark	Min %
C	93	47%
D	81	41%
E	70	35%
F	57	29%
G	44	22%

Maximum mark: 200.

Core · Papers 12, 32, 52

Grade	Min mark	Min %
C	98	49%
D	86	43%
E	75	38%
F	63	32%
G	51	26%

Maximum mark: 200.

Core · Papers 11, 31, 61

Grade	Min mark	Min %
C	93	47%
D	81	41%
E	70	35%
F	57	29%
G	44	22%

Maximum mark: 200.

Core · Papers 12, 32, 62

Grade	Min mark	Min %
C	99	50%
D	87	44%
E	75	38%
F	63	32%
G	51	26%

Maximum mark: 200.

Core · Papers 13, 33, 63

Grade	Min mark	Min %
C	101	51%
D	89	45%
E	77	39%
F	65	33%
G	53	27%

Maximum mark: 200.

Calculate your Combined Science grade →

Official source (PDF) →

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