Hi

Earlier i. e till 2020 , jee main used to be conducted Only twice i. e January and April session.

But now,

From 2021 , JEE main examination is conducted in 4 sessions i. e

*February session
* March session
*April session.
* May session

No, it is not compulsory to attempt all the 4 sessions
It totally depends upon   students when it comes to how many sessions out of the 4 sessions they want to attempt. One is free to  appear in all the four session or only in 3 sessions or only two  sessions or even  only one session , so it's entirely student's choice.

When a candidate appears in more then one  sessions then the best performance out of the  attempted sessions will be considered for admission i. e if you appear in all the 4 or 3 or 2 session of Jee mains, then your best score out of these  attempts will be considered for your  admission process.

From your question it seems,

Your are new to jee, so in case if you are planning to appear in jee main next year , I will suggest you to give all the 4 sessions of jee mains , so that even if you are not able to score good marks in one session, you can improve your score in the subsequent sessions .

In ideal / normal condition the exam will be conducted in February, March, April and May only but this year due to the pandemic. Jee main 2021 April and may session has not been conducted yet and it has been postponed and new dates will be announced 15 days prior to the exam

To prepare well you can go for our jee program at the convenience of your home, the link for the same is provided below

https://learn.careers360.com/knockout-jee-main

Thank you