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OCR A-level Biology A H420 Paper 3: Unified biology

H420/03 · 1 hour 30 minutes · 70 marks · 26.0% of the A level.

What it examines

All six modules.

At an hour and a half, it is the shortest of the three written components.

Read from Cambridge OCR Level 3 Advanced GCE in Biology A, H420, Specification, Version 4.1, April 2026, printed page 5 (page 11 of the PDF), retrieved 21 August 2026.

Where to get the papers

June 2025

• Question paper - Unified biology (H420/03), June 2025 Question paper
• Mark scheme - Unified biology (H420/03), June 2025 Mark scheme
• Examiners' report - Unified biology (H420/03), June 2025 Examiner report

June 2024

• Question paper - Unified biology (H420/03), June 2024 Question paper
• Mark scheme - Unified biology (H420/03), June 2024 Mark scheme
• Examiners' report - Unified biology (H420/03), June 2024 Examiner report

June 2023

• Question paper - Unified biology (H420/03), June 2023 Question paper
• Mark scheme - Unified biology (H420/03), June 2023 Mark scheme
• Examiners' report - Unified biology (H420/03), June 2023 Examiner report

June 2022

• Question paper - Unified biology (H420/03), June 2022 Question paper
• Mark scheme - Unified biology (H420/03), June 2022 Mark scheme
• Examiners' report - Unified biology (H420/03), June 2022 Examiner report

November 2021

• Question paper - Unified biology (H420/03), November 2021 Question paper
• Mark scheme - Unified biology (H420/03), November 2021 Mark scheme
• Examiners' report - Unified biology (H420/03), November 2021 Examiner report

November 2020

• Question paper - Unified biology (H420/03), November 2020 Question paper
• Mark scheme - Unified biology (H420/03), November 2020 Mark scheme
• Examiners' report - Unified biology (H420/03), November 2020 Examiner report

June 2019

• Question paper - Unified biology (H420/03), June 2019 Question paper
• Mark scheme - Unified biology (H420/03), June 2019 Mark scheme
• Examiners' report - Unified biology (H420/03), June 2019 Examiner report

June 2018

• Question paper - Unified biology (H420/03), June 2018 Question paper
• Mark scheme - Unified biology (H420/03), June 2018 Mark scheme
• Examiners' report - Unified biology (H420/03), June 2018 Examiner report

June 2017

• Question paper - Unified biology (H420/03), June 2017 Question paper
• Question paper - Unified biology insert (H420/03), June 2017 Question paper
• Mark scheme - Unified biology (H420A/03), June 2017 Mark scheme

OCR publishes the H420/03 papers it makes public on OCR’s assessment page for Biology A H020/H420, with the other papers in the qualification. The H420 past papers page shows what is published and when we last checked.

We checked these links against the exam boards’ websites on 31 August 2026. We do not host or reproduce past papers or mark schemes. If a link has moved, go to the board’s own past papers page.