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For every session the application from will be reopened for a while you can fill the application from for every session separately. If you have payed for all the four session at once then you will not be able to change your photograph and the signature photo. The correction window does not allow to change the photo or signature. NTA has released JEE Main 2021 application form on Dec 16.  Candidates can fill JEE Main 2021 registration by visiting NTA website at jeemain.nta.nic.in. Last date of JEE Main 2021 application form is January 16.   Payment of JEE registration fee of Rs. 650 for unreserved category and Rs. 325 for Female/ SC/ST/ PWD. Only online JEE Main 2021 application form is available.