GATE scores are only for application to graduate programs in Engineering disciplines in India. Usually IISc application dates are within 4�5 days of announcement of results. Most institutes do not specify their cut-offs for previous years. So there is a general confusion in terms of selecting institutes and specializations. But in the recent years IIT Kharagpur and Guwahati have been specifying last year cut-off mark list.
Typically the Indian Institute of Science is the most selective, very closely followed by the IITs. In general IISc and the IITs only admit students scoring among the top 3 percentile on the GATE, to their post graduate programs.