Your grade journey
Cambridge AS Marine Sciencegrade boundaries
Explore official boundaries. See where your marks take you.
96935 official seriesMaximum mark 150
Exam series
Papers
Flight log / June 2026
Grade boundaries
OfficialPapers 11, 21 · Out of 150
Grade a
99
marks / 150
Grade b
83
marks / 150
Grade c
71
marks / 150
Grade d
59
marks / 150
All grade thresholds
| Grade | Minimum mark | Mark range | % of maximum |
|---|---|---|---|
| a | 99 | 99–150 | 66% |
| b | 83 | 83–98 | 55% |
| c | 71 | 71–82 | 47% |
| d | 59 | 59–70 | 39% |
| e | 48 | 48–58 | 32% |
| U | Below 48 | ||
These boundaries apply to this exam series and route.
How these boundaries have changed
Papers 11, 21, every official series. Boundaries move each year with how hard the papers were.
| Series | a | b | c | d | e |
|---|---|---|---|---|---|
| June 2026 | 99 | 83 | 71+2 | 59+3 | 48+5 |
| November 2025 | 103+2 | 87+3 | 73+3 | 60+4 | 47+4 |
| June 2025 | 99+5 | 83+9 | 69+8 | 56+7 | 43+6 |
| November 2024 | 101 | 84 | 70 | 56 | 43 |
| June 2024 | 94 | 74 | 61 | 49 | 37 |
+ higher than the same series a year earlier (harder to reach) · − lower (easier to reach).
Grade calculator
June 2026 · Papers 11, 21
Enter your mark for each paper to see your grade.
83 marks needed for Grade b.
Frequently asked questions
What was the boundary for a grade a in June 2026?
99 out of 150 on papers 11, 21; 98 out of 150 on papers 12, 22; 99 out of 150 on papers 13, 23 — the top grade for AS Marine 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.