The AQA board was criticised for including an “unanswerable” question in its Chemistry paper, and OCR admitted to a mistake in its Biology A-level paper sat by 19,000 students on Monday.

An AQA spokesperson told the ECHO: “We’re very disappointed to hear that some students may have seen our A-level Chemistry paper 2 before the exam.

This BBC Bitesize article features AQA biology past papers, explores practice questions and worked examples to help students prepare for the biology GCSE exams.