Here is a set of free short videos for stepwise preparation of Data Sufficiency on GMAT. For a more detailed treatment of the topic, you may want to opt for our GMAT online course or our GMAT test series of 15 mock tests.
Approach for DS Questions
1 of 5 - Common Mistakes in Data Sufficiency
2 of 5 - Common Mistakes in Data Sufficiency
3 of 5 - Common Mistakes in Data Sufficiency
4 of 5 - Common Mistakes in Data Sufficiency
5 of 5 - Common Mistakes in Data Sufficiency