it should have a low rating. There are loads of errors in the book, and just creating an errata does not do it for me. I bought that book 2 months ago, but a lot of little things are not mentioned in there - load on startup - findAttributes - pagecontext (good explanation at least) - errors in explanations - errors in questions and answers these are just from the top of my head, but believe me there are loads more errors. DONT BUY THIS BOOK i'm still trying to use this book, since i do not want to spend another �40 on a book. But i have to do all the web test exams with more care, since it more of a learning excercise than an excercise to see how good i am.