Dear student,

A student can give jee mains for three consecutive years so as in your case if you appeared for jee in 2020 and also passed you class 12th boards examination in the same year then you can definitely appear for all the sessions of jee mains up to three consecutive years i.e. up till the year 2022. But the number of attempts for jee advanced are limited till only 2 consecutive years. This year you will be eligible for advanced also.