Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Not worth the money

There is very little use to this book. It has no substance. The practice tests are old, outdated, and poorly reproduced. There are tests in here that are older than I am. Heck, I think some of them are older than my mother.More importantly, there are no explanations given as to why answers are right or wrong. It's just tests, answer keys, and a few paltry paragraphs of less substance than your standard Wikipedia entry. A total waste of money and time.