Hi sharmahardik,
Many Test Takers are unhappy with their initial practice scores, but you really shouldn't be. That 430 is just a measure of your skills right now - and you'll improve on that result over time as you learn more about the content, Tactics and little 'secrets' of the Exam. Many GMATers spend 3 months (or more) of consistent study time before they hit their 'peak' scores, so giving yourself 3-4 months of study time is a smart choice.
For free math practice and help, I recommend that you set up an account at Khan Academy (
www.khanacademy.org). The site is completely free and makes the learning a bit more fun and 'game-like' (as opposed to the dry academic approach taken by most books). While the site is vast, you should limit your studies to basic Arithmetic, Algebra and Geometry. You might choose to spend a little time re-building those skills, before you start your more formal GMAT studies.
Before I can offer you any additional advice, it would help if you could provide a bit more information on your timeline and your goals:
1) How many hours do you think you can consistently study each week?
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