Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Useful practice, but lots of errors

I bought this book for practising real GRE chemistry tests and wasn't disappointed by the test material it contains.Unfortunately, several solutions are simply wrong. Additionally, the book contains lots of typographical errors that make it hard to select the correct answer choice. Chemical formulas are often written incorrectly, too.For example, one question asked about the REAL gas law, while the solution dealt with the IDEAL gas law. Sometimes the explanations do not even match with the possible answer choices.The book is recommendable if you intend to practice for the test without paying the money for ETS' book, but you must be aware of the fact that a discrepance between your solution and the "correct" answer choice doesn't necessarily mean you're wrong.