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. Chris Pearce has an MA in maths and over 30 years’ teaching experience at secondary level through KS3 to KS5. Now a full-time author, education advisor and examiner, he has written many bestselling KS3 and KS4 materials for Collins.