Hi aspirant,

See once the details in admit card has been verified and signed by candidate then it is very difficult to make changes in the personal details. Now you would have to visit the nearest regional educational office in order to validate the process or contact your school so that they can communicate with higher officials and get the process done. But I am clearing that there is no online process in such to correct the details. Do not worry because you would have a lot of time to correct this mistake as it only comes handy at time of admission into Universities.

Hope it helps!