Helen Ball is co-author of the new Collins Core Maths resources. She is an ex-IT project manager who switched to maths teaching, rising to Head of Mathematics and teaching from KS3 through to KS5. She is an IGCSE and A-level examiner. Michael Kent has 20 years’ experience teaching Pure Maths, Mechanics and Statistics for AS and A Level Mathematics and Further Mathematics, twelve of them also leading a successful department. He co-authored the most recent editions of Collins’ GCSE Maths Student Books.