Hi Sahil,
Given your general score goal, and the practice score data you've provided, you will have to make some big improvements to how you handle BOTH the Quant and Verbal sections. Unfortunately, 3 weeks really isn't enough time to improve that much (you'll likely need another 2-3 months of consistent, guided study to get up to that level).
Before I can offer you the specific advice that you're looking for, it would help if you could provide a bit more information on how you've been studying and your goals:
1) How long have you studied?
2) What materials have you used?
3) How have you scored on each of your CATs (including the Quant and Verbal Scaled Scores)?
4) What is your exact goal score?
5) When are you planning to apply to Business School?
6) What Schools are you planning to apply to?
GMAT assassins aren't born, they're made,
Rich