On purchasing this book, I was hoping to find a resource that showed my level of knowledge with the product. As it turned out, it showed me a new way of looking at the various problems which could arise and numerous situations which one might have to deal with in the field. There was quite a bit of technical information present which was nowhere to be found in any of the other study guides on the market. The questions are well structured and most importantly, when the answers were displayed, the wrong answers were supplied with exlpanations. This book is a really worthwhile companion to any study guide which you have chosen to use, but don't rely on this book alone. It is meant as a readiness indicator and will not explain all the topics in full.