Instruct: Classify a given Amazon review into positive or negative sentiment.
Query: Deceiving

I bought the whole set based on some posts I saw at a GMAT forum along with the Princeton Review GMAT books, and the Official Guides.After doing all three of them, I've this to be the most disappointing. There's a couple of reasons:1) there's some typo errors, which should be fixed as this is a study book2) there's questions and sometimes even entire passages copied STRAIGHT out of the Official Guide. I'm not sure the copywrite law on this but it was really tedious since I already went over the OG. Also, it was a waste of my money to have bought both the sets.3) the explanations are mediocre at best. There's also little follow-up and in depth explanation.4) The level of the questions were too easy. If you're looking to boost your 500 to a 600 this book might help. If you're looking to get a 700+, these books have almost no material dealing with that diffculty.Either way though, if you have the official guides (11th edition), you basically have these books