Hi dear,
You have to clear different exam for different courses jee advance, IIT JAM, GATE,KVPY for taking admission in IISC Bangalore. You can check details here
https://www.google.co.in/url?q=https://engineering.careers360.com/articles/iisc-bs-eligibility-criteria&sa=U&ved=2ahUKEwiD9YLf7NXnAhWF7XMBHYCwDlgQFjAOegQIBhAB&usg=AOvVaw3Co_UuX1oKbPJNPUoKWiid
Hope it helps.
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