OCR A level Biology A specification
The specification (H420) is OCR's own description of the Biology A course: what you can be examined on, how the exams are set out and how they are marked. The link below opens the board's PDF on ocr.org.uk, so you always get its current version.
Open the H420 specification (PDF) (opens ocr.org.uk in a new tab)Everything for OCR A level Biology A, with the past papers, grade boundaries and the notes and flashcards people have shared.
How OCR A level Biology A is examined
From OCR's grade boundaries for June 2026. Some boards list every optional paper or time-zone variant, so you sit only the ones for your route; the specification says which.
| Paper | Marks | Time | Next exam |
|---|---|---|---|
| Biological processesH420/01 | 100 | 2 hours 15 minutes | Monday 7 June 2027, afternoon |
| Biological diversityH420/02 | 100 | Monday 14 June 2027, afternoon | |
| Unified biologyH420/03 | 70 | Friday 18 June 2027, morning |
Turn a mark into a grade · OCR A level exam dates · Extra time and access arrangements
Revising from the Biology A specification
Work through the specification's content list and mark what you are unsure of, then practise those parts with OCR's past papers and read your marks against the same year’s grade boundaries.
Common questions
Where can I find the OCR A level Biology A specification?
The link on this page opens OCR's own copy of the Biology A specification (H420), a PDF on its website, so you always get the current version. We link to it rather than keep a copy.
What is in the Biology A specification?
A specification is the board's own description of the course: the content you can be examined on, how the exams are set out and how they are marked. It is the most useful single document to revise from, because every exam question has to come from it.
How is OCR A level Biology A examined?
According to OCR's grade boundaries for June 2026, the course is examined in 3 papers, worth 270 marks in all. The specification has the full details, and the past papers show what the questions look like.
Can I make practice questions from the specification?
Yes. cookie can make exam-style questions from a specification and mark your answers, so you can practise the parts you are least sure of once you run out of past papers.
More specifications: every A level specification we link.
cookie is independent and is not affiliated with or endorsed by any exam board. Every paper here is a link to the board's own copy on its own website, and the papers belong to the boards that set them. If a link has stopped working, the board's own past paper page is linked on each course.