Hi abhishekjagatdeo,
Many GMATers spend 3 months (or more) of consistent study time before they hit their 'peak' scores, so studying for the GMAT now - and giving yourself plenty of time before you plan to take the Exam - is a smart choice. As far as the type of GMAT Score that you might "need", that will depend a great deal on the Schools/Programs that you are interested in, the strength of your OVERALL profile and when you plan to apply.
You might also find it beneficial to speak with an Admissions Expert about your overall profile and plans. Those Experts should be able to answer your Admissions questions and help define the specific areas of your profile that could use some improvement. There's a Forum full of those Experts here:
https://gmatclub.com/forum/ask-admissio ... tants-124/Before I can offer you any additional advice for your studies, 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 so far? How many hours do you typically study each week?
2) What study materials have you used so far?
3) Have you taken any practice CATs/mocks yet? On what dates (or approximate dates) did you take EACH of your CATs and how did you score on EACH (including the Quant and Verbal Scaled Scores for EACH)?
4) When are you planning to apply to Business School?
GMAT assassins aren't born, they're made,
Rich