Hello Aspirant,

Yes , you can join BSc 2021 session with your 2020 marks , usually for regular BSc admission there is no such limitations. What you need is a pass in 12th with minimum 50% aggregate in physics ,chemistry and biology.The admission process will vary with every college ,some will be on direct 12th merit basis and others will be on an entrance basis followed by a personal interview. So to know about the same ,kindly visit the official website of the college you wish to join or contact them directly. The fee range may range from INR 10,000 - 3L per annum depending on the college.

https://www.google.com/url?sa=t&source=web&rct=j&url=https://university.careers360.com/colleges/list-of-bsc-in-microbiology-and-virology-degree-colleges-in-india&ved=2ahUKEwi_k5P82ITuAhUEbisKHX4QDBIQFjABegQIARAB&usg=AOvVaw2S-VT_9zcWvbBe3JXyDDiP

All the best