Steve Fearnley & June Haighton 
Oxford International AQA Examinations: International GCSE Mathematics Extended [PDF ebook] 

The only textbook that offers complete coverage of the Oxford AQA International GCSE Mathematics Extended Level specification (9260), for first teaching from September 2016. Written by experienced authors, the clear, international approach ensures strong mathematical understanding and provides exam-focused practice to build assessment confidence. Ensure students develop the key mathematical, reasoning and problem solving skills needed for the Extended Level exam and provide an excellent grounding for A Level study.