Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Please do not waste your money

This book and cd will not do a thing for you. spend your money on Nova's gmat prep, princeton, and kaplan books and of course the official guide. Agreed that these are not perfect books but they complement each other and you are able to learn something from each of them. The peterson book will only aggravate you since the author doesn't seem to know much about gmat. The cd rom only takes you to their web site and you cannot work offline. Not that you would want to since the problems are nothing like the ones on the real gmat tests.