i have done mbbs from india and i am finding difficulty in maths.i want to know which book should i read for basics?
Take a look at the links in my signature.
I would probably recommend you start with kaplan math workbook
Founder of GMAT Club
Just starting out with GMAT? Start here... | Want to know your GMAT Score? Try GMAT Score Estimator
Need GMAT Book Recommendations? Best GMAT Books
Co-author of the GMAT Club tests
Have a blog? Feature it on GMAT Club!
Get the best GMAT Prep Resources with GMAT Club Premium Membership