Dear aspirant hope you are doing well..

Yes, you are eligible for jee main in year 2021 as a candidate have 3 consecutive attempts for jee main. So you are eligible for year 2021,2022 and 2022. But for jee advance a candidate must score more than 75% in 12th / Board exam. So you are only eligible for jee main exam. ..

you can read the article for more details click on the link below..

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

Hope it's helpful for you. Thank you..