Hello aspirant.

NTA is providing JEE mains application correction facilities from January 19 to January 21 for the February session exam. Hence the candidates can change their details, academic details, Change of paper, Language of Exam, Name, state of eligibility, and date of birth, Category. Hence to change your category, If you change your category from general to reserved, then no refund of fees was done. However, if you change your category from reserved to general, then you have to pay the balance fee.

For more information refer to the below link.

https://www.google.com/amp/s/engineering.careers360.com/articles/jee-main-application-form-correction/amp

Hope this answer helps you.

All the best!!!!