I scored 21030 rank in general and 6400 rank in obc category so whivh will be considered for upsee counselling.

Hello dear,yes you will get that college which has a closing rank of 6400 in obc.So don't worry and pray for the best.Whenever a candidate belongs to a reserved category, he is allotted seat on the basis of his category rank.The condition is that you should have a valid caste certificate both central and state.By,validity i mean that it should be not older than 6 months from counselling date.

Hope i am clear,you can use college predictor for more info related to predictions.

https://www.careers360.com/upsee-college-predictor

Thanks.