GCSE Chemistry B (Twenty First Century Science) grade boundaries
J258OCR · June 2024 to June 2025
Approximate. Ofqual lines up the bottom of 7, 4 and 1 with the bottom of A, C and G. Ofqual's comparison (opens in a new tab)
Check a mark
Add up your marks across every paper in a past series and enter the total. The chart and table below update to show what it would have got in every series.
Exam series
Enter a mark to see your grade.
Boundaries move every series, so treat this as a guide, not a prediction.
Every series
The minimum total mark for each grade. Entry code J258.
| Series | Max mark | 9 | 8 | 7 | 6 | 5 | 4 | 3 | Source |
|---|---|---|---|---|---|---|---|---|---|
| June 2025 | 180 | 141 | 127 | 114 | 94 | 75 | 56 | 46 | Board PDF, p1 (opens in a new tab) |
| June 2024 | 180 | 128 | 114 | 100 | 81 | 63 | 45 | 36 | Board PDF, p1 (opens in a new tab) |
These are overall raw-mark boundaries for the whole qualification. Component boundaries, and anything we don't hold yet, are in OCR's grade boundary documents. If a figure here doesn't match the board's document, the board's document is right.