Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Disappointing review material.

I also bought this book as part of my review materials for the PE exam thinking that it would be a comprehensive summary of the equations used in each chapter. It is not. Maybe 20% of the material is provided. I didn't even bring it with me to the exam. You're better off making your own review sheets and spending your money on tabs for the Reference Manual (which is VERY good).