I find this book useful to pass the exam. The book contains enough questions relevant to the exam. It can cover all the topics, and also can give me a clear concept. However, I think that the questions about case study are not good enough. It is not very similar to the live exam, and these questions are a little bit easy.I pass the exam with 900 marks with this book and the training guide by New Riders. Anyway, it is worth to buy it.