Hello there ,

Hope you are doing well . See,if you changed your address in your aadhar card ,you should carry both the Aadhar cards while the document verification in the college you'll be allotted. The address that you already entered while filling the application form of NEET UG-2021 cannot be changed now .

When you go to your allotted college for document verification,there you should produce your new aadhar card with the changed address (though you should carry both old and new ones) and inform the college authorities there itself . There ,whatever instructions will be given by them you'll have to follow that but most probably your new address will be entered into their records.

Hope my answer helped .