Hey there

JEE mains is conducted to take admission in all nits, gftis, iiits and is considered tough. Due to which government has given chance that one can take the test 3 consecutive year but 3 consecutive means you should not have any gap or else that year will be wasted.

Check about JEE mains

https://www.google.com/url?sa=t&source=web&rct=j&url=https://engineering.careers360.com/exams/jee-main&ved=2ahUKEwiB_qWt5bHkAhUKLI8KHfAuBDkQFjAAegQIBhAB&usg=AOvVaw1k3rMyr-Osb0qy4gsPfOaR

Good luck