Hi
sajalsharma,
Welcome to GMATClub!
To begin with, Follow Bunuel at the Math Forum
His signature contains some awesome questions that give you the true taste of GMAT
You could find this collection in "Collection of Questions" (eg : Baker's Dozen, 12 Easy Pieces etc..)
Make sure you solve each and every question he puts up on the forum.
IMO, the best way to go about the GMAT Quant preparation is to
work on your weak areas using the
Quantitative Mega-threadThis thread contains theory for all the Quant topics. It makes sense to understand the theory associated
with each topic and follow that up with some related practice. You can find practice questions on
specific topics, here at GMATClub(Search by tag).
If you are specific looking for a book, I have heard that the Manhattan Guides are your best best
(at least at the starting level). For testing the concepts that you have tests, you could also take the
GMATClub Tests!
Hope this helps you!