To avoid confusion, I completed only Critical Reasoning part of it. However, making in average 75% of correct answers (1 mistake in every 4 questions set), I got some serious doubts about extraordinary type of questions there.
They are good, but not much more.
On the other note, format of the book is really weird. I don't like it. I believe the willingness to do a guidebook drove them to such a style, but it doesn't help at all. I'd prefer something closer to a "classic" approach, when I clearly have a set of questions to work through, and the answers to clearly state correct answer, but not looking for it in the several blocks of explanations.