Instruct: Classify Amazon reviews into positive or negative sentiment
Query: I could write a better algebra book!

I bought this because I've never been great at math, and wanted to refresh myself before I go back to school. It's the WORST book I've ever bought! The answers in the back don't match the questions you're supposed to be answering! What's up with that!? How are you supposed to know if you are doing this right if they give you wrong answers??