Step By Step Breakdown
Looking at the GRE preparation tips in Testking, you'll find step by step breakdowns of problems, as well as information and explanations about things like the area of the circle, factorials, etc, that are not in the other book. It offers strategies that when applied, really can raise your score. The online practice tests are essential and are EXACTLY like the real test.Overall, I would say that Testking is so much more user-friendly than other books and I recommend it over others, if you are only planning to get one.
Omeena"

Ability To Answer Questions
The GRE does not test intelligence or academic promise, but rather one's ability to answer GRE questions correctly. And this Testking book does indeed provide the background info and strategies, and the GRE preparation tips needed to do this and improve one's score. My only preparation was to work through this Testking book, which helped explain the GRE test creation mentality, formulaic routines you can use to rule out certain answers, and info on what the essay scorers are looking for.
Lolita"

Quick Review
Testking provided a quick review simplified enough to at least improve one's chances of selecting a correct answer. I only wish it had included more practice questions, hence the 4 stars instead of 5. When I took the official GRE, my score went up by 60 points on maths and 40 points on verbal: exactly 100 points of improvement! I didn't become a smarter person overnight--I just used some of the strategies and GRE preparation tips from Testking. It was well worth the time/money investment.
Patrick"

Just Took The GRE
I just took the GRE last week and studied with Testking which helped me tremendously! Very user friendly and concise. I also had purchased other review book, but rarely opened it after getting the Testking 'help'. I raised my score significantly by simply reviewing the provided vocabulary lists daily for 2 weeks before the test. I also benefitted from some of the easy maths strategies and GRE preparation tips, I did not know. I would definitely recommend this book to anyone taking the GRE.Thanks again!
Potter"

Greatest Of All
I have found this book particularly useful when it comes to explanations about how to crack the various sections of the GRE, especially the quantitative section. I'll also suggest to insert some sentences in the vocabulary section to make clearer the use of the words commented which are only explained in their meaning. Given that i haven't taken my GRE yet i also hope that the sample tests and preparation tips are similar to those provided by the Testking on the real GRE test. This is the greatest of all.
Marlin"