Hi Abhishek,

According to NTA, any student who has qualified 12th or its equivalent exam in the year 2020, 2021 or about to pass in 2022 is eligible for appearing in JEE Mains if he had Physics, Mathematics and either one of Chemistry, Biology, Biotechnology as technical/vocational/optional subject. Please find attached the detailed eligibility criterion for qualifying JEE Mains right here:

https://engineering.careers360.com/articles/jee-main-eligibility-criteria

Eligibility for JEE Advanced depends on the student's performance in JEE Mains and highly on the cutoff for Mains for the specific year and a few other factors. Find every details for qualification for JEE Advanced- cutoff, age limit, number of attempts, 12th boards identified by NTA, marks for 12th and everything else, right here:

https://engineering.careers360.com/articles/jee-advanced-eligibility-criteria

Thank you. Hope that helped :)