Hi Subhrajyoti,
DS questions are unique to the GMAT, and it takes time to properly train to handle them, so it's okay if you're not an expert yet.
I'd like to know a bit more about how you've been studying and your goals/timeline:
1) How long have you been studying?
2) What materials have you been using?
3) What is your score goal?
4) How did you score on this CAT Test (including the Quant and Verbal Scaled Scores)?
5) When you say you got "killed" by DS, what fraction of your DS questions did you get wrong?
GMAT assassins aren't born, they're made,
Rich
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