hi,

see jee main exam has already over and results has released, however before the examinations of both of the sessions correction window has opened to make correction in necessary details. however right now you can not change category, you must have the necessary document to support your category claim, unless  you may participate in counselling based on your general category rank.

To know about complete list of probable college name, based on your score, category please use Careers360 college predictor tool

https://engineering.careers360.com/jee-main-college-predictor?icn=QnA&ici=qna_answer