OCR A Level Biology A 2026 Papers & Mark Schemes

OCR A Level Biology A 2026 papers can help you practise biological explanations, calculations and interpretation of unfamiliar data. Choose resources for H420, match each paper with its own mark scheme and check the assessment code before starting. Biology A is different from OCR Biology B and from AS Biology A.

Quick answer: H420 has three written papers: Biological processes, Biological diversity and Unified biology. Practical skills are also assessed in written questions; the separate practical endorsement is not a fourth written paper.

OCR Biology A: which paper is which?

Paper	Time and marks	Module coverage
H420/01 Biological processes	2 hours 15 minutes; 100 marks	1, 2, 3 and 5
H420/02 Biological diversity	2 hours 15 minutes; 100 marks	1, 2, 4 and 6
H420/03 Unified biology	1 hour 30 minutes; 70 marks	1–6

The written-paper weightings are 37%, 37% and 26%. Check the official OCR assessment overview for the complete qualification requirements, including the practical endorsement.

Choose the correct 2026 resource

Start from the OCR resources overview at Tyrion Papers, select the available A Level Biology A resources and check H420 and the series. Read the contents of the chosen option carefully. A question-paper-only option does not include its mark scheme; a mark scheme lists creditworthy points but may not explain every step in the way a worked solution does.

Keep the question paper and matching mark scheme together. Do not pair a paper from one year or component with a similarly named mark scheme from another.

Turn marking into better biological explanations

Attempt a paper before reading the answers. When reviewing, identify whether you lacked a biological idea, misunderstood the question or expressed a correct idea too vaguely. These problems need different repairs. Relearning a chapter is inefficient if the actual issue was failing to compare both groups in a question.

For a comparison, state the difference clearly and support it with appropriate evidence. For an explanation, connect the biological process to the observed outcome. Avoid adding several unrelated facts in the hope that one earns credit; build an answer that addresses the question being asked.

Practise data and practical reasoning

For each graph, read the axes, units and conditions before describing the pattern. Check whether the question asks for an observation, a calculation or a biological explanation. An accurate trend description is not automatically an explanation of its cause.

When evaluating a practical method, name the limitation and explain its effect. For example, “repeat the experiment” is less useful than explaining how repeated measurements would help assess variability. If you propose a control, say what it controls and why that matters to the investigation.

A revision cycle for Papers 1–3

Attempt: complete a timed section or full paper without the mark scheme.
Classify: label each lost mark as knowledge, application, communication, data handling or calculation.
Repair: write a short improved answer or practise the missing calculation.
Check transfer: answer a new question using the same concept in another context.
Connect: revisit how the concept links to other parts of the course before attempting Unified biology.

Keep a concise error log rather than copying pages of answers. Record what you will do differently next time: include units, use a numerical comparison, name the relevant process or state the effect of a variable.

Frequently asked questions

Is H420 the AS qualification?

No. H420 is full A Level Biology A. OCR AS Biology A uses H020 and has a different assessment structure.

Is Paper 3 only practical biology?

No. Unified biology draws across the course. Revise connections between biological ideas alongside practical and mathematical skills.

Can I use 2026 papers for later revision?

Yes, when they match your course. Use them with the current specification and teacher guidance, and keep practising unfamiliar questions across the whole syllabus.