Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Test software is a messy junk.

NEVER buy this book. The test software is extremery hard to maneuver. It will comsume your precious time and frustrate you.It can even crash your computer.You cannot remove it because "Remove GMAT diagnostic." is the only option given and the relevant file is even missing. I do not know how this "GMAT" thing got in.It is a shame on Princeton Review to publish and sell this kind of junk software.