Official Guide for the GMAT 12th Ed.

Below are video explanations to all of the math (Problem Solving and Data Sufficiency) practice questions in the GMAT Official Guide, 12th Edition.

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Section 5.3 Problem Solving

Section 6.3 Data Sufficiency

Other Official GMAT Material

Official Guide for the GMAT 13th Ed.

Official Guide for the GMAT 2015 14th Ed.

Official Guide for the GMAT 12th Ed.

Revised GRE PDF 2nd Ed.