Hi chhabdasunpreet,
If you have not already done so, then you should set up an account at
www.mba.com. Once that's taken care of, you'll be able to search all of the available Test Centers and Test Dates/Times available to you. As an aside, scheduling the GMAT at the last possible moment doesn't allow for very good long-term planning (and most Test Takers do their best studying when they have a reasonable deadline to work under).
1) How long have you studied?
2) What is your goal score?
3) When are you planning to take the GMAT?
4) When are you planning to apply to Business School?
GMAT assassins aren't born, they're made,
Rich