Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Not too useful

I bought this book, hoping for some definitive answers. But the math explanations were pretty bad, using a lot of text, and very few scribbly diagrams. The reading explanations weren't the best either.The College Board's explanations are terrible too (not this book), and extremely lengthy. As you well know, the College Board claims you can't study for the SAT, so if they were to give good explanations, it would be self-defeating.