Hi.

Kindly visit the official site to know if you are eligible for BCE category.

http://www.ncbc.nic.in/user_panel/centralliststateview.aspx

If you do, you can take part in All India Counselling for deemed universities. Even if do not belong to BCE category, you can still take part. It will not effect your counselling process whatsoever. However, do not change it to general category if you belong to OBC category as it might lead to any kind of disqualification, I believe. You can also contact MCC helpline number for further clarification. Hope it helps!