JEE main 2021 registration date is not announced yet. It is expected that National Testing Agency (NTA) will soon release the JEE Main 2021 application form date. It is advised to visit the official website- jeemain.nta.nic.in regularly as scheduled will be released on the above site.
For more details visit the link below:
The syllabus and reduced by the official for the upcoming session.
JEE Main exam date 2021 for January exam will be postponed to February.
Application form will be available soon though.
Hope this helps!!