Your Caste/Community should be listed in the Central OBC list. Only then will your OBC-NCL will be considered. If your Caste/Community is not listed under the Central OBC list then you will be considered under General Category. Let's say your Caste/Community is listed in the Central OBC list, then you will have to submit your Caste Certificate and Income certificate during counselling. There is also a proforma for OBC in the Information Bulletin. You should download that and fill it up and self attest it.