ArpanaAmishi wrote:In real exam, do we have any limit on Scrap papers ....

From the www.mba.com website

The administrator will provide you with a booklet of five (5) noteboards at the start of your test. If you fill these noteboards during your test, you may request replacements by raising your hand. You may not remove these noteboards from the testing room at any time. Every noteboard must be returned at the end of the test session. You may not take your own noteboard into the testing room.

My own notes:
Each of these noteboards is an A4 sized sheet of laminated plastic, checkered. It's designed to be erasable (you're also provided with a thin-tipped water based black erasable pen), but is not easy to erase without cleaning fluid, which you are not provided with. In any case, you can use both sides, so you end up with the equivalent of 10 sheets of A4 "paper".