Your grade journey
Cambridge IGCSE Combined Sciencegrade boundaries
Explore official boundaries. See where your marks take you.
06537 official seriesMaximum mark 200
Exam series
Your papers
This subject has 13 paper routes with different boundaries. Pick each paper you sat.
Route: papers 21 · 41 · 51
Flight log / June 2026
Grade boundaries
OfficialExtended · 21 / 41 / 51 · Out of 200
Grade A*
146
marks / 200
Grade A
124
marks / 200
Grade C
80
marks / 200
Grade E
59
marks / 200
All grade thresholds
| Grade | Minimum mark | Mark range | % of maximum |
|---|---|---|---|
| A* | 146 | 146–200 | 73% |
| A | 124 | 124–145 | 62% |
| B | 102 | 102–123 | 51% |
| C | 80 | 80–101 | 40% |
| D | 69 | 69–79 | 35% |
| E | 59 | 59–68 | 30% |
| F | 49 | 49–58 | 25% |
| G | 39 | 39–48 | 20% |
| U | Below 39 | ||
These boundaries apply to this exam series and route.
How these boundaries have changed
Extended · Papers 21, 41, 51, every official series. Boundaries move each year with how hard the papers were.
| Series | A* | A | B | C | D | E | F | G |
|---|---|---|---|---|---|---|---|---|
| June 2026 | 146+2 | 124+3 | 102+4 | 80+4 | 69+4 | 59+4 | 49+4 | 39+4 |
| November 2025 | 151-1 | 127-1 | 103-1 | 80 | 70+2 | 60+3 | 50+3 | 40+3 |
| June 2025 | 144-5 | 121-4 | 98-3 | 76-1 | 65-2 | 55-3 | 45-3 | 35-3 |
| November 2024 | 152 | 128 | 104 | 80 | 68 | 57 | 47 | 37 |
| June 2024 | 149 | 125 | 101 | 77 | 67 | 58 | 48 | 38 |
+ higher than the same series a year earlier (harder to reach) · − lower (easier to reach).
Grade calculator
June 2026 · Extended · Papers 21, 41, 51
Enter your total mark to see your grade.
124 marks needed for Grade A.
Paper-by-paper entry isn’t available here: this subject's papers are weighted and the board doesn't publish the weighting factors in its boundary documents. Use your total subject mark from your results slip.
Frequently asked questions
What did you need for a grade E in Combined Science in June 2026?
In June 2026, grade E in Cambridge IGCSE Combined Science (0653) needed 59 out of 200 on extended · papers 21, 41, 51; 59 out of 200 on extended · papers 21, 41, 61; 55 out of 200 on extended · papers 22, 42, 52.
What was the boundary for a grade A* in June 2026?
146 out of 200 on extended · papers 21, 41, 51; 146 out of 200 on extended · papers 21, 41, 61; 145 out of 200 on extended · papers 22, 42, 52 — the top grade for IGCSE Combined Science in June 2026.
How is my grade worked out?
Your marks from each paper are added up (scaled by a weighting factor where papers count differently) to give your subject mark, which is then compared with the boundaries. Your grade comes from the total — not from each paper separately.
When will the next boundaries be published?
Cambridge publishes grade boundaries on results day for each series. Until then, any figures shown for a future series are Starley estimates, clearly labelled, based on recent years.