If I get 80% in CBSE class 12 then can I get admission in BBA in ravenshaw?

Usually, during the first round of admission, Ravenshaw BBA cutoff stays around 80%. If you have scored 80% in 12th, there’s a good chance that you will get admission. 

For further rounds of admission, the required cutoff decreases depending on the number of seats available. During the third selection round, the required cutoff becomes 50%.