According to provisions in the Constitution, all government institutions in the country are mandated to provide 15% reservation for scheduled castes, 7.5% for scheduled tribes and 27% for other backward castes (OBCs). The IITs and IIMs have not been implementing reservations in entirety.

from Times of India https://timesofindia.indiatimes.com/india/use-quota-policy-in-faculty-hiring-government-tells-iits-iims/articleshow/72176458.cms