Dear Sir,

I.I.Sc Bangalore is one of the most premium institutes in the nation and hence getting  into here is really competitive. According to official website of I.I.Sc Bangalore last year  this was  the range for  OBC-NCL candidate CRL ranks: 7501-12000 to get admission here ( check this - https://ug.iisc.ac.in/news.html ) . Now according to this one should at least have percentile around 99.35+ ( might vary , subjected to certain factors of JEE Mains 2021). Also these might help -

https://engineering.careers360.com/articles/jee-main-preparation-tips

https://learn.careers360.com/knockout-jee-main-april/?icn=jee-main-knockout_landing-page&ici=nav-header_engg

Dear candidate, if you are in OBC category then to take admission in Btech in IISC Bangalore you need to get above 96.2 percentile to be on safe side. Students of OBC category need to get 6000 OBC rank (27000 AIR) approx. to take admission in Btech in IISC Bangalore.

Hope, it helps!