I passed the first 3 tests using this book, practice tests from selftestsoftware.com and the most important thing...actually, using the software (creating databases, using the scripts, creating users, etc). You can't expect to pass by just reading a book. If you want to be a Oracle DBA, you have to actually use the software. If you look through all these reviews, you'll notice that the people that passed actually used the software and the people that complain and didn't pass probably just relied solely on this book.