Hey gaurav.

Admission in IISC Bangalore in the BS ie Bachelors in Science course is done based on 3 channels- JEE Mains, JEE Advanved and KVPY. Hence separate merit list is prepared based on each candidate who has applied based on their scores in either JEE Mains, Advanced, KVPY. You need a minimum of 60% marks in qualifying exam to be eligible for admission here. The application process for the same might start in the month of February. You can use the link below for more details.

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

Best of luck