Hey Nidhi

Don't worry, it happens quite frequently. You should contact the examination authorities regarding the same. Write an email to them or call them and describe the issue you are facing. I am pretty sure they will help you with your problem. Since you have mentioned two different colleges in your tags, I will provide you the email id for both of them- admissions.2019@jnujaipur.ac.in (Jaipur National University)

coe@mail.jnu.ac.in ( Jawaharlal Nehru University)

I hope this helps you. Feel free to ask any other queries.