Hi reader,

If by 3 chances you mean 3 years then As of now Any candidate can appear for jee mains for 3 consecutive years  from passing their class 12 boards. If you have exhausted all the attempts in the 3 years then you can not appear for jee mains for the fourth time.

If by 3 chances you mean 3 attempts in a single year like in JEE mains 2021 then yes you can fill the form during the 4th attempt too when NTA opens the registration portal.

i hope this answer solves your query

thank you