Hi Gaurav, definitely it would take time to get an OBC certificate if you apply now. So, iys completely fine to proceed if they aren't asking to upload the necessary certificate right now and just ok with you filling in the category. You can later on present the required certificate to the authority.

But remember there are legal norms for every college and university. So if that goes well with your one's, and they are ok with the submitting of OBC certificate at a later point, you can do that way.

Hope this answers.

Thanks.