For JEE MAINS 2021, the 75% criterion is relaxed. So if you have passed the Boards examination in 2020/2021 then you will be eligible for the examination and you can sit for the JOSAA counselling 2021.

To know more about JEE MAINS eligibility criteria visit the link below:

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

For JEE MAINS rank predictor 2021 visit the link below:

For JEE MAINS college predictor 2021 visit the link below:

I hope this answer helps. All the very best for your future endeavors!