Hi sreenathhh,
Any additional time that you can commit to studying (by pushing back your Test Date) would likely improve your chances of hitting your score goal. In your last post, you stated that you planned to study 25-30 hours per week, but when do you plan to do that (is that how many hours you're studying right NOW?)?
Beyond doing lots of practice problems though, you need consistent, professional guidance, so that you can learn all of the patterns, tactics and 'secrets' of the GMAT (without having to try to figure out all of that stuff on your own). You would likely find it beneficial to invest in a GMAT Course of some kind (either Guided Self-Study or instructor-led). Most GMAT Companies offer some type of free materials (practice problems, Trial Accounts, videos, etc.) that you can use to 'test out' a product before you buy it. We have a variety of those resources at our site (
www.empowergmat.com). I suggest that you take advantage of all of them then choose the one that best matches your personality, timeline and budget.
If you have any additional question, then just let me know.
GMAT assassins aren't born, they're made,
Rich