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 Total GMAT Math Jeff's complete Quant guide, on sale now!
 Total GMAT Verbal Everything you need to ace GMAT Verbal!

1,800 Practice Math Questions

Buy Jeff's books at Amazon.com

GMAT Official Guide, with IR
OG Math | OG Verbal
OG12 & Quant Rev solutions!

GMAT Question of the Day
Beginner's Guide to the GMAT
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## Official Guide Explanations: Now Free!

###### October 8, 2010

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I always recommend The Official Guide for GMAT Review as a primary resource for anyone planning to take the GMAT. The OG's practice questions are the closest you can get to the real thing.

The explanations, however, leave something to be desired. Many solutions are overcomplicated or opaque, relying on "textbook" methods that simply aren't practical under the time constraints of the GMAT Computer Adaptive Test.

GMAT Hacks Guide to the Official Guide

To address this deficiency, I wrote my own set of explanations. Some are similar to those in the OG, while others are very different. For any given problem, you might find my solution more or less easy to understand, but in general, students find that my explanations are a huge step up from those in the book.

Now, my explanations—over 450 of them—are free! Click here for the complete list of questions from the Official Guide, including the diagnostic test.

Also free are my directories to OG questions, organized by both topic and difficulty level. My students and customers have been finding these sorted lists to be invaluable resources for years.

PDF Booklets Remain Available

In the past, I've sold these explanations in a PDF booklet. The booklet is still available for sale, and you may find that it is still a wise purchase.

Once you own a copy, the booklet is available offline, and the formatting is much more attractive. Because of the limitations of HTML and cross-browser compatibility, some mathematical concepts, such as fractions and roots, do not display as clearly online.

About the author: Jeff Sackmann has written many GMAT preparation books, including the popular Total GMAT Math, Total GMAT Verbal, and GMAT 111. He has also created explanations for problems in The Official Guide, as well as 1,800 practice GMAT math questions.

 Total GMAT Verbal The comprehensive guide to the GMAT Verbal section. Recognize, dissect, and master every question type you'll face on the test. Everything you need, all in one place, including 100+ realistic practice questions. Click to read more.