Instruct: Classify a given review as either positive or negative.
Query: Regret to buy this book

Many reviewers have commend that this book is poor in organization and explanation, I don't want to repeat. But one thing I would like to remind the potential buyers that this book includes all the past exam questions of FRM. I believe that it is the only attractive point of this book.But the explanation of the answers of the past questions are also not very good.