Hello Aspirant,

As You have not mentioned about the university or college. This is not something to be worried about. Please report as soon as possible to your college's administration block if you have misplaced your admit card.

They will provide you with the ideal direction for your next move. You'll probably get another admit card from them.  If you are in school the admit card will be sent to you by your school if you are a regular candidate; if not, you can download it. It is available for download online at cbse.gov.in for private candidates.

ALL THE BEST