Hi Iqraaa,
Raising a 330 to a 400 is a nice improvement, but you will have to do considerably more work to get to the point that you could consistently score 650+. That type of improvement will likely require at least another 3 months of consistent, guided study - and you'll have to make significant improvements to how you handle BOTH the Quant and Verbal sections. Thankfully, the GMAT is a consistent, predictable Exam, so you CAN train to score at a higher level. You would likely find it beneficial to invest in a GMAT Course of some type (either Guided Self-Study or instructor-led), so you should plan to look into the available options.
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 out 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.
It would help to know a bit more about your overall timeline:
1) When are you planning to take the GMAT?
2) When are you planning to apply to Business School?
3) What Schools are you planning to apply to?
GMAT assassins aren't born, they're made,
Rich