My son was determined to do AS level Maths in spite of a mediocre performance at GCSE. He hit problems in the first term as soon as they started on Calculus. So I bought him this neat little guide to Calculus - on a friend's recommendation - and my son worked all the way through it. He said he had never read a text book like this before - he thought the author was talking directly to him. Everything was clearly explained, with lots of supporting diagrams. Now he is confidently looking forward to continuing Maths at A2 level - because his teacher said that if you can crack calculus, the rest of the A level content just falls into place. So if your kids need help with AS Maths, help take the pressure off by giving them this book.