Hello aspirant

As cut off percentile for St Category Jee main is 39.0696, you have qualified Jee main 2020. Being at candidate and getting 85 percentile, you have chances of getting. Seat in CBIT but whether you get CSE or not , depends upon cut off of the college. Cut off depends upon number of candidates appeared and qualified in exam, difficulty level of exam, previous year's cut off and availability of seats etc.

Now let's talk about 2019 cut off cbit

CBIT cut off for CSE Category wise

General 11028

OBC 5023

SC 12302

St 12911

PWD 11028

For College prediction following link may help you

https://engineering.careers360.com/jee-main-college-predictor?icn=QnA&ici=qna_answer