Funnily enough this book actually helped me to pass my Amazon grad scheme numerical reasoning tests! I was really not very good before, kept failing all my numerical tests. As soon as I worked through this book I passed every single one I had to do. Each time I have one I just revisit the last section of the book (which is 15 long questions) and it seems to really work. It helped me so much! Breaks down all the calculations so you really get used to them before you move onto the longer questions. It's all basic GCSE stuff, but with age I forgot how to do all the sums quickly. REALLY recommend this book!!