Hello sameer,

Hope you're doing well.

IISC or indian institute of science is the premier institute in our country for sciences and research. The admission or the selection is on the basis of KVPY/JEE MAIN/JEE ADVANCED.

the cut off (last year) is as follows:-

1. General category- 250-255

2.OBC category- 5000-6000

3. SC category- 7000-8000

4. ST category- 4000-5000

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

You may follow the above link for further assistance.

Hope this helps you.