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

I wouldn't consider myself too picky on the obvious spelling and technical errors; for someone who was recently enrolled in an IB economics course, I was pretty much open to any help. Unfortunately this book doesn't cut it. Not only does the author explain concepts and theories in an unfathomable manner, he also manages to throw in complex ideas at the worst of times. I took the IB economics exam two years ago, and let me tell you, this book provided me with zero help. Time and time again, I thought it was just me and I used it as a reference for the papers and exams due in the course. And each time, it provided me with zero and sometimes negative assistance. Please, if you want to pass your class and the IB exam with flying colors, then I recommend the IB Economics Course Companion!