Elmernet 

GCSE Exam Boards and Practice PapersThe examination Boards have reorganised their websites again  These details were updated in July 2015Edexcel
GCSE (AH) Last Examination June 2016GCSE (91) First Examination June 2017 http://qualifications.pearson.com/content/demo/en/qualifications/edexcelgcses/mathematics2015.html
IGSCE
http://www.edexcel.com/quals/igcse/igcse09/maths/mathsA/Pages/default.aspx
AQAAQA Mathematics Resources Page AQA Also have linear and modular options  more free resources here. http://www.aqa.org.uk/subjects/mathematics/gcse/mathematics8300/assessmentresources Resources for new GCSE (91)
OCR


