I self studied and scored a 770 on the GMAT. Here are my thoughts on the Official Guide Quant book:
===== OVERVIEW =====
The Official Guide for GMAT Quantitative Review is the math supplement for the Official Guide series published by GMAC, the creators of the GMAT. As is the case with
The Official Guide for GMAT Review, 12th Edition and
The Official Guide for GMAT Verbal Review, 2nd Edition, this book contains retired GMAT questions and as such is a great source of practice problems.
However, the concepts section of the quant supplement is not worth your time. It is virtually a copy-paste of the equivalent section in
The Official Guide for GMAT Review, 12th Edition, in itself undoubtedly insufficient for anyone looking to get a high score in quant. Although "the math skills tested [typo in the supplement - the authors wrote "test" instead of "tested"] on the GMAT test are quite basic" as the book suggests in one of its "Myth vs. Fact" information boxes, basic math can and will be tricky on the GMAT. The book contains:
* 176 Problem Solving
* 124 Data Sufficiency
===== PROS =====
* Retired GMAT questions will familiarize the test taker with commonly-tested question patterns on the GMAT. Unofficial questions sometimes lack the structure of actual questions; this is because test prep companies have not succeeded in replicating the GMAT official "style" in their own practice problems
* At a little over $10 on amazon.com, it's great value for your money - particularly useful for GMAT hopefuls having trouble with Data Sufficiency, since 124 extra practice questions of this GMAT-specific type of problem will be valuable
* Questions are ordered in increasing level of difficulty, so if you are interested in a particular level (say advanced), you can just focus on the corresponding part of the book
===== CONS =====
* Does not provide many advanced practice problems, so if you feel you have a solid quant background, it's sufficient to go through the regular Official Guide for GMAT Review book
* Tips/strategies section is below average, so expect to spend some money on a guidebook or two that provides better GMAT concept overview
* Explanations are not as high quality as those found on
The Official Guide for GMAT Verbal Review, 2nd Edition. You might notice that there are easier or faster ways to solve some of the problems presented
===== BOTTOM LINE =====
The Official Guide for GMAT Quantitative Review is a great resource for practicing easy/medium difficulty questions, but not much else. If you're shooting for a high score and/or have little time to prepare, this is not the book for you; you will be better off investing some time in other material or the primary Official Guide for GMAT Review book. However, if you've been out of school for a few years and believe that you need to practice the basic stuff, go for a general strategy guide or a quant specific guide and then use this quant supplement as a practice question resource.
IMPORTANT NOTE: The second edition of the Quantitative Review was released in the summer of 2009, but there are few significant differences between this book and its older version: only 74 new questions, or close to a quarter of total. The only notable difference between the two editions is a greater emphasis on geometry in Problem Solving and word problems in Data Sufficiency. Do not fret if you have the first edition already! It's just as good and costs mush less. A complete list of new problems:
* Problem Solving: 1, 2, 7, 13, 41, 60, 61, 62, 64, 67, 68, 69, 70, 71, 72, 76, 78, 80, 81, 83, 86, 102, 103, 108, 112, 117, 131, 135, 142, 145, 146, 147, 149, 150, 151, 152, 153, 154, 155, 156, 157, 158, 160, 162, 173
* Data Sufficiency: 1, 6, 7, 9, 11, 13, 14, 16, 21, 22, 24, 33, 43, 48, 51, 66, 70, 73, 79, 82, 85, 96, 102, 104, 107, 111, 116, 117, 122
Good luck on your GMAT prep!
About me: Dana Jinaru, 770 GMAT scorer, expert at Beat The GMAT - a community serving 100K+ GMAT students/month