Hello aspirant!

Criteria is for getting admission in IISc is that candidate should secure minimum 60% marks in class 12.You can get admission in IISc through KVPY,JEE MAIN,JEE ADVANCED.For this you have to fill the form of IISc and after that you have to participate in online counselling and based on your KVPY/JEE MAIN/JEE ADVANCED score you will get IISc.

For more details you can find here:

https://www.iisc.ac.in/ug/info_brochure.html

Hope it answer your concerns.