No, candidate can not change his/her category at the time of counseling

If you wish to change your category from ST to UR category, you have to do this at the time of registration. Once you have locked your application form, it can not be changed

Candidates are given one chance to correct their application form(date will be announced soon), after that, no change is allowed.

From past few years,caste validity certificate is compulsory for NEET aspirants, it is not required for registration but at the time of counseling.

You can check your caste validity certificate online

Best of luck