hello,

the eligibility criteria of Jee main for year 2020 is :-

1. Should have qualified +2 in year 2018 or 2019 or will appear +2 in 2020.
2. There is no age limit but must have cleared intermediate 2018 or 2019 or going to appear 2020.
3. There are 3 attempts for a candidate and in a year there are two sessions one in january and another in april time

If you satisfy all the eligibility criteria mentioned above then you can apply for it.

For more information:-

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

Hope it helps!