You should reach out to the helpdesk at the email available on the admit card. For your convenience, here it is; jeemain-nta@gov.in (mailto:jeemain-nta@gov.in) . Please mail them from your registered email and they will make a note of it and let you know the next course of action. Also attach a screenshot of your admit card and that will be much easier.

Hello,

If you filled your application form properly then you can show it that there was no mistake from your side. There won't be any problem then. If there is mistake by your side then that might be an issue.

No need to worry. Just prepare yourself for exam. Rest will go as per rules and regulations and it will get tackled any way.

If you still want  to do something then you can write a mail to the board stating the problem or contact them using the toll free number and ask for a solution. Do as they say or guide to you. This is the only way.

Do as you feels correct and will be right for you. Meanwhile keep preparing and practicing. don't neglect them. You will just miss the important time. just do your work and let them respond. don't wait for anything. keep on doing your work

Hope it helps!