Instruct: Classify Amazon reviews into positive or negative sentiment
Query: This is one of the worst book i have ever used for textbook

I took the electrical engienering course with this book and it was a pain in the ass. first of all the material is very difficult, the professor tries to rush through everything and there is no time for any practice. When i try to do the practice at home, there is NO answer key whatsoever. And the book examples are extremely limited. I also question the author's summarizing skills, mentioned too many redundant formulas and not enough explaination and focus. Overall a very bad book for an already difficult course.