If you need additional help with Data Sufficiency, we'd suggest checking out the following resources:
- Blog Post: Introduction to GMAT Data Sufficiency: basic approaches
- Blog Post: GMAT Data Sufficiency Tips and Tricks: 6 tips to help you ace this question type
- Blog Post: DS Strategies: how to choose numbers to plug in in DS with variables questions
- Blog Post: GMAT Tip: Timing Strategies: don't run out of time!
- Video: DS Workflow Flowchart: tips to help you get to the the answer choices