Hello there,

For the year 2021, the JEE Mains exam is going to conduct in 4 sessions i.e. in February, March, april and may.

The candidates can apply to all the sessions at one time, but the application form fee has to be paid, depending on the number of sessions you want to appear.

But if you have not filled the february application form, then don't worry. You can fill the application form for next 3 sessions.

NTA will open the application form window for the next 3 sessions separately. So, you can fill the form that time. For more, visit the link given below.

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

Hope it helps.