Hi Gaurika24,
Quitting your job so that you can focus on studying for the GMAT is likely NOT a good idea; leaving your job to focus on your start-up might be fine though - so much of this will come down to your focus during the next couple of months (and how you might 'message' that type of decision in your applications). That's ultimately an Admissions question though, so you would likely find it beneficial to speak with an Admissions Expert about your overall profile and plans. There's a Forum full of those Experts here:
https://gmatclub.com/forum/ask-admissio ... tants-124/Before we discuss how you might better study for the GMAT during this next phase of your studies, it would help if you could provide a bit more information on how you've been studying and your goals:
Studies:
1) How did you score on your prior Official GMATs (including the Quant and Verbal Scaled Scores for EACH)?
2) How long did you study for each attempt?
3) What study materials have you used so far?
Goals:
4) What is your overall goal score?
5) When are you next planning to take the GMAT?
6) What Schools are you planning to apply to?
GMAT assassins aren't born, they're made,
Rich