Jeff Sackmann
About the Author
Jeff Sackmann has been helping students like you reach their GMAT score goals for nearly a decade. Jeff began as a star tutor and classroom teacher for a big test-prep company. Since 2006, he has focused on developing the best materials in the industry, saving you time, money, and stress.
Based in New York City, Jeff has created many resources for GMAT preparation, including the popular Total GMAT Math and Total GMAT Verbal, as well as 1,800 practice GMAT math questions and his Guides to the Official Guide.
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Total GMAT Math and Verbal Success Story


Messages like these always make my day.


I wanted to thank you for preparing excellent study guides. I had taken the Manhattan GMAT class twice and had done hundreds and hundreds of OG and Manhattan problems, then took the Gmat and got a 580. After my first test, I took two weeks completely off from studying and purchased Total GMAT Math and Total GMAT Verbal. Then I studied consistently for three weeks using your books and scored a 710.

Your books really helped me in two ways. I felt like they were the back to basics approach that all of my previous studying was missing. Your approach guided me into the more difficult problems by establishing sound fundamentals. Second, using the PDF forced me to get used to doing problems on a screen even more than practice tests. It took me a solid week of studying to get used to the screen, but come test day it was second nature.

Thank you again!

Congratulations, Will!