Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Don't buy this book!

The biggest complaint that I have with this book is that the answers explained are horrible. They are either useless or only confuse you more. I would highly recommend you to buy the REA(Research & Education Association) Review Book. It also has two tests but the answers explained section is quite helpful, not only telling you why an answer is right, but why each wrong answer is wrong. I have also found the test questions to be much more difficult and confusing in this book than any review book I got and from the actual exam that I just took. I am rather sorry that I wasted my money on this book and urge you not to do so as well.