Hey!

You can attemot MAH CET exam twice and for this you either must be a final year student or should have bachelor's degree. And there is nothing such mentioned that if you partcipate in 2020 counselling then you will be ineligible for 2021 exam. If you get a good college in 2020 counselling and get admission there then also you are eligible for 2021 ( second attempt). You can check the eligibility criteria here:

https://bschool.careers360.com/articles/mah-cet-2021

Thankyou