You may wish to take a look at Engineering Mathematics by K A Stroud -
http://www.amazon.co.uk/exec/obidos/...148904-1570055 . I used this for GCSE and A-Level, and is excellent. Very easy to follow, a pretty big book, but you'll pick things up quickly. I guess it will have more in than you need, but I found the teaching style very good to work with.