Hi gokul prasad,
If you can consistently study at that level without 'burning out', then you could make some big improvements in the time that you have. 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