Hey Pranav.

See u cannot change ur category right now from the Gen to the OBC as u have been asked earlier only that if u are having any criterion then u should be applying for that. Also at the time of the counselling or admission u can resist ur category only i.e. if u have opted for OBC category and want to take admission in the GEN category then u can do that but not the vice versa.

Hope u got ur point. Ask if any query.

Good luck