Hostels in NIT C for the PG students are not good. Students are allotted to the Professor's Apartment in their first tear.
This was the scenario of the first year and for the second year students, the scenario is a bit different. The second-year students are mostly accommodated in the MBA hostels which have toilets attached with the rooms but are far from the previous apartments where you were living in the first year.
Wi-Fi is available on the campus and works well for the new buildings and hostels. At the time of joining they will tell you that the new hostels are under construction and will be ready to move soon.
Please take a note that if possible go for the kitchen as that will be the only single room accommodation available for you as a PG student in NIT Calicut.