Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Best Book - but supplement with other software

I used several GRE prep books, and this was by far the most useful. It seems written for a more intelligent audience - those aiming for 700+ on the Quantitative and Verbal sections. The "Hit Parade" section gave clear definitions as they are given on the GRE. I also reviewed the book's Analytical Writing section the night before the exam and it greatly helped organize my thoughts.The only way to improve this would be to add a CD-ROM with practice test software. The Princeton Review's online exam was difficult to access and required registration, and the book didn't give access to any more than the basic online test (which is already free to anyone). Use this book in combination with other testing software for better results.Also, don't buy separate vocabulary flash cards unless you are in a real hurry. It was much more efficient for me to make my own flash cards with index cards, based only on the words that were new to me.