Hello,

Yes you can give BITSAT 2020 as the eligibility criteria states that students applying for BITSAT 2020 must have passed class 12 not earlier than 2019 which means they must have passed class 12 in 2019 or appearing in 2020. So as you have passed in 12th in 2020 you can give BITSAT in the year 2021. You need to have 75% overall percentage in PCM/B and 60% individually in PCM/B.  Please click the below link to know more.

https://engineering.careers360.com/articles/bitsat-eligibility-criteria