Hi geetgmat,
I am happy to provide some advice on how to improve your GMAT quant score. However, it would be helpful to first learn more about your GMAT experience and MBA goals.
1) What is your GMAT score goal?
2) Have you taken any official MBA.com exams? If so, what are the score breakdowns of those exams? When you took the practice tests, did you take them under realistic conditions (e.g. in a quiet environment, no extended breaks)?
3) What is your study routine? For how many hours a day have you been studying and for how many total months? What resources have you been using for your prep?
4) To what schools do you plan to apply?
5) What deadlines are you targeting?
Once you provide me with that information, I can give you some more tailored advice.