This book is truly golden for doing integral. Content: Very exhaustive. You will find all the integrals you will do in high school and college here. Method: The author approaches integral in common sense, by building up from the elementary integrals and how to transform others back to "doable" ones. This has both drawback and advantage. The advantage is that the approach make it easy to classify integrals thus make it easier to remember (It is used to train students in contests after all). And easy for looking up later. However, beware that the purpose of this book is "doing integral" only, and if one is looking for any further interpretations or meanings of any particular integrals, this is not the book he/she should buy. Being too immersed in this book would limit the scope of one's mathematical understandings.