Quant

• An essential book that will be your primary source of practice no matter your quantitative ability.
• Practice the numerous problems to get a hang of the style of questions asked in the GRE.
• The level of difficulty of the questions is similar to that of the actual GRE.

Verdict: It is a must-buy.

• The difficulty level of the quant questions is similar to the actual GRE.
• However, the book doesn’t teach you how to attempt questions. (It does, but the methodology is weak and not instructive enough).
• The practice tests at the end are useful.

Verdict: Optional. Buy if you are looking for questions by the test-makers themselves.