Marcus du Sautoy meets a detective who uses maths to help solve crimes. Relevant for teaching Maths at KS4 and GCSE in England, Wales and Northern Ireland and National 4/5 or Higher in Scotland.

How does the GCSE maths exam work? The Edexcel GCSE maths exam is spread over three separate papers - each part is worth 80 marks and has a 33.3 per cent weighting.

But nowadays pupils can get a single exam trending on Twitter, as was the case after thousands of GCSE students sat what appeared to be a particularly tricky Edexcel Maths paper.

A tricky GCSE maths question stumped thousands of students - but inspired them to take to Twitter to vent their anger and frustration. The equation in Thursday's Edexcel exam was on the ...