Ayush, Now you could not able to correct your mistake because the Application Correction form has already closed. It had been again restarted from 20 July till 26 July 2020 to correct your mistake but now you missed it. It is limited time period for candidates to rectify their mistakes.

May be now you are able to rectify your mistake in UPSEE Counselling or else you can try to mail to administrative body of UPSEE regarding to correct your mistake.

Don't ever make such mistake again because you must be face difficulty.