Hey, Mani!

In such a case, you should immediately get in touch with the NTA regarding this to try to get it corrected in the admit card which will be required during the counselling. You can find their contact details on the last page of the following file: https://jeemain.nic.in/WebInfo/Handler/FileHandler.ashx?i=File&ii=44&iii=Y . Please note that you might have to pay additional money to make those changes. Or else, try to get in touch with the college you are planning to apply to directly and follow the steps they tell you to follow, preferably before the counselling begins to avoid last minute confusions and problems. You can find the contact details on the college's webiste. They typically reply to the emails within 24 hours or 1 day. If they don't, try contacting their helpline numbers and take follow ups regarding the email you sent.

Hope this helps.