I'm not usually one to complain, but this book and the CD that came with it were absolutely terrible. The book itself was okay in some ways, good layout etc., despite some errors like those beneath said. But add to that the fact that it gives you NO INDICATION of how you are going to do on the GMAT whatsoever- it doesn't even take a stab at giving you any scores. Or tell you the difficulty ratings, or anything useful. I really regret not looking ahead of time to see which books were the best; I chose this one for the CD-rom, maybe naively expecting it to give you an authentic experience and an expected score, both of which it entirely failed to do.
They don't even mention that the answer choices have no letter on the test, so they train you to go by A, B, C, D, E... and it's totally different. There were also several mistakes in the scoring. The CD had marked several correct answers wrong, with the explanation saying the one they'd marked wrong was right, it was almost insulting. It was a trainwreck...
Avoid this book at all costs! I won't bore you with the specifics of how terrible this book was. Just don't buy it... And to add insult to injury, when I wrote to them complaining about it, they didn't even attempt a decent apology. Boo. You ought to be ashamed McGraw Hill.