Hello aspirant.

Now you cannot make any changes in your Jee mains application as time is already passed .

NTA allowed candidates to make corrections of there were any mistakes in application.

Now you cannot change your category in application and category remains same as in application.

To predict college refer

https://engineering.careers360.com/jee-main-college-predictor?utm_source=C360&utm_medium=qna&utm_campaign=jee-main-college-predictor

All the best.