Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Worst math book I have ever come across

I had a 4.0 GPA in my math major at a top 20 private university in the U.S. and have loved solving math problems my entire life. My eighth grade son currently has the misfortune of being required by his prep school to use this book. The book is plain awful, full stop. This is the very first year my son's school has used this book, and I am going to do all I can to ensure it is the last.