Hello, If you are attending the February session as a general candidate and change the consecutive sessions into EWS category then only one of the session mark will be valid. The board has not yet given any official notification regarding the category change in different sessions but it allows the candidate to change the category in the correction window in the first session. It is better that you change the category in the correction window of the February session itself. It is expected to open form 19th January 2021.

For more details on the application process kindly refer this link

https://engineering.careers360.com/articles/jee-main-application-form

Best wishes