Dear Rushiket, if you have chosen a category that gives you reservation benefits and you secured a seat with the help of the category benefits, it is mandatory to submit the fertificates that validate your claim that you belong to the said category. For example if you chose OBC-NCL as your category, you need a proof validating that your caste comes under OBC and a certificate which proves that you come under NCL category. These documents are mandatory at the time of counselling.