DS improvement strategy

Leveraging your error-log to see which types of DS questions you find slippery could be helpful. In case you've run out of Official-Guide questions, consider checking whether you can activate/access any online exclusive questions from your guide(s). You can get e-versions of different guides from the MBA website.

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One key approach you can use is to practice DS untimed and make sure you're picking up on all the angles and constraints involved in the questions. Do questions one at a time, and any time you miss one, analyze what you did and log it in an error log. You'll likely find that just a few patterns underlie most of your errors.

For instance, I personally sometimes answer the question I expected to see rather than the question asked, and when I discovered that pattern, it was underlying around 30 to 50 percent of my errors in Quant.

Once you've identified the patterns underlying your errors and have learned to avoid falling into those patterns and your are achieving high accuracy, work on speeding up to test pace while maintaining high accuracy.

What resources did you previously use when studying for your GMAT?

Strategies and Tactics for DS Section

GMAT Tip of the Week: The Data Sufficiency Reward System
GMAT Tip of the Week: The Heart of Data Sufficiency
GMAT Tip of The Week: Tonya Harding Teaches Data Sufficiency
C-Trap Questions
Veritas Prep blog on C-Trap.
Manhattan GMAT blog on C-Trap.
Another Manhattan GMAT blog on C-Trap.
Warning: Don't Fall Into the C Trap on Data Sufficiency Questions
Easy (A)/(B) Trap in Data Sufficiency Questions on the GMAT
How to Breakdown Data Sufficiency Sequence Questions on the GMAT
How to Make Abstract Data Sufficiency Questions More Concrete
Math Knowledge is Often Insufficient on Data Sufficiency
Why You Should Do the Math on Data Sufficiency GMAT Questions
GMAT Tip of the Week: No Resolution!
GMAT Tip of the Week: LeBron James Says Don't Be Cavalier About Your Initial Data Sufficiency Decision
Data Sufficiency: Why Are you Here?
GMAT Tip of the Week: Kanye West Teaches You How To Live The Data Sufficiency Good Life
When Do You Have Enough Information on Data Sufficiency GMAT Questions?

For more check Ultimate GMAT Quantitative Megathread

Hope it helps.