GMAT Data Sufficiency Problems
Questions 28 - 50, pg 280 - 281
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.
The videos on these lessons are for GMAT Practice Questions 28 - 50 (starting from page 280 in the Study Guide)
Questions 28-32, pg. 280
Questions 33-36, pg. 280
Questions 37-41, pgs. 280-281
Questions 42-46, pg. 281
Questions 47-50, pg. 281
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