This book won't teach you how to do any specific maths techniques, but it will help you to learn how to "do maths". Some of the advice is quite simple, but it really does take it to be written down before you think about it. Other techniques are less obvious, but equally helpful. I found the book helped me move form A-level thinking, where you are in effect given all the information you need, to University level where you need to explore and work with concepts and techniques more. The section on proofs was particularly helpful and useful.