GMAT Data Sufficiency Problems
Questions 1 - 27, pg 278 - 279
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 1 - 27 (starting from page 278 in the Study Guide)
Questions 1-5, pg. 278
Questions 6-9, pg. 278
Questions 10-15, pgs. 278-279
Questions 16-21, pg. 279
Questions 22-27, pg. 279
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