Hi Rudranket,
When it comes to study options for the GMAT, there are LOTS of options besides live in-person class sessions. If that's the only option that you're interested in, then your options will be limited by your location, your schedule and your ability to get to the locations of the classes. If you're comfortable with online options though (instructor-led classes or guided Self-study), then you have far more options to find the perfect resources for your needs.
What is your goal score?
When are you planning to take the GMAT?
When are you planning to apply to Business School?
GMAT assassins aren't born, they're made,
Rich