Assuming youre a General Category Aspirant, you need a Minimum Rank of 250-300 Varying over Years in JEE Main/Advanced/NEET for securing a seat in IISc Bangalore for BS, which is somewhat too unpredictable and tough. However, you have another stream to a IISc Bangalore, which KVPY, though equally tough, but if prepared effectively and strategically in 2 Chances, KVPY SA/SX, there are chances you secure a seat.

However, if you belong to certain Category, you still have certain Relaxations in Cutoffs with the AIR Eligibility Cutoff of OBC at 5000-6000 in JEE Advanced/Main/NEET UG.

For more information about IISc Bangalore Admissions do follow the link below

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