GMAT Data Sufficiency Problems
Questions 121 - 137, pg 288 - 289
Free online video lessons from khanacademy
covering the practice questions in the data sufficiency math section of The Official Guide
for GMAT Review.
It would be best that you go through the GMAT practice test questions in the Study Guide first and then look at the videos for the questions that you might need help in.
These video lessons are for GMAT Practice Questions 121 - 137 (starting from page 288 in the Study Guide)
Questions 121-124, pg. 288
Questions 125-128, pg. 288
Questions 129-131, pg. 289
Questions 132-134, pg. 289
Questions 135-137, pg. 289
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