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.

But an AQA A-level law and GCSE physics paper included topics not listed in "advance information". Watchdog Ofqual said such mistakes caused "distress" for pupils.