Hello student as admission in IISC BS course IS Also through Jee main and Jee advance just like for the admission in B.tech course. So you need to full fill the Jee eligibility criteria you must have mathematics in your class 12 as eligibility criteria says - Candidates must passed or appearing class 12 with physics chemistry and mathematics with minimum 75 percent marks aggregate from a recognized board.
Application for jee main April examination starts from 07th of February and extended till 12th of March 2020.
NEET eligibility criteria is not enough for admission in IISC BS course as admission is only through Jee Advance
For more updates refer to the link mentioned below
https://www.google.com/amp/s/engineering.careers360.com/articles/iisc-bs-admission/amp
Feel free to comment if you have any doubt
Good luck

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