Hello student ,

• Earlier, candidates had only three chances to attempt JEE Main, but now since JEE Main will be conducted twice a year, the number of attempts have been revised too.
• Candidates can now make maximum of six attempts for JEE Main in three consecutive years.
• Therefore, for JEE Main 2021 candidates have two chances to attempt the exam, one was in January 2021 and then in April 2021.

Further to know more you can go through the link given below -

https://engineering.careers360.com/articles/jee-main-number-of-attempts

Hope it helps !