As this is a book aimed at helping you pass a test, errors are pretty unforgivable. And this book contains far too many errors and typos. I wouldn't think it possible to pass the exam with just this book to study from. For example - at one point the book makes up a whole new section of the web application deployment descriptor.
Overall, the book is poorly written with confusing, badly explained sections and example questions that contradict the main text.
Certainly not worth the money. There are many other books for this exam now - get one of those.