Hi Surya,

Glad that you are planning to go to such a great college. The most reputed college of our country. And so it is also highly competitive to get in there. But I will still give you the data as I just checked. 

JEE MAIN-For General,you need to score 60%.For OBC 54% and for SC/ST/Physically handicapped students-30%.

For KVPY,please do go through the link below attached herein. 

https://www.google.com/amp/s/engineering.careers360.com/articles/iisc-bs-admission/amp

All the Best !