Hi Dr Parag Paradkar,
The ability to properly do basic math is a must for the Quant section (and it also helps in the IR section). Given your concerns about your current math skills, there are some things that you can do BEFORE you start formally studying for the GMAT.
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. After spending a little time re-building those skills, you can start your GMAT studies.
1) What is your score goal?
If you have any additional questions, then you can feel free to contact me directly.
GMAT assassins aren't born, they're made,
Rich