According to an admission notification https://www.iisc.ac.in/wp-content/uploads/2020/01/UG-advertisement-2020.pdf , the last date to fill in the applications is April 30th. At this point in time, the official website https://www.iisc.ac.in/important-dates/ has no new updates for admission to Undergraduate courses. Only the registration dates for M.Tech for sponsored Armed forces has been extended. But nothing for Undergraduate courses at this point in time. May be we may have an update post the completion of the current lock down period.Please watch out for more information on their official website.