Hello Raghuveer

You need to write an email to helpdesk of your examination board,and you need to request them to help you out with this situation.

As information you provided isn't enough, so I don't know which exam you are talking about for ex  icet or mah cet.

If you clear these things,may be I can help you further,and try to find a proper solution for you.

I hope it helps,

Feel free to ask queries for more guidance.