I am rating this book base off the relevance of the exam. This book is not tailored for the exam. It is more tailored for people who really don't have understanding of XP at all. Trust me, I took the test base solely on content of this book, and I was lost. A-lot, again A-lot of information was not covered. If you don't believe me, read this book, then try picking up an up to date 270 Exam Cram book, and you will instantly see miss information that was not covered in this book.You have been warn.