Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Simply terrible.

I can't come up with the words to describe how bad this book is. It's completely full of typos, spelling errors and duplicate facts/phrases (on the same page even). Worst of all there are many errors in the answer sheets and practice tests so you never really know if you've studied the correct facts. I cannot imagine that anyone proofread this book before going to press.Skip this one, it's seriously not worth the time to pick it up and there are better study guides out there.