Hi Sanskruti,
In my prior post, I mentioned that I thought that you would need at least another 3 months of consistent, guided study to hit your goal - and I still believe that that is the case. On a fundamental level, a 680 is essentially the same score as a 700, so you would likely need at least another 3 months to hit that score too.
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