I've mentioned before that many people from Kerala, including those at NIT Calicut, tend to stick to their own circles, preferring to interact with other Malayalis rather than outsiders. The faculty at NIT Calicut mostly consists of Malayalis, so you won't find many Hindi speakers, and even fewer from Tamil or Kannada backgrounds. This can make it tough for students from North India who primarily speak Hindi, as they might struggle to find folks who share their cultural background.
I don't mean to criticize the people of Kerala, but they generally aren't known for being very open to outsiders. Compared to states like Tamil Nadu or Karnataka, Kerala is less developed, with lots of nature like jungles and beaches. With rain for most of the year, students often feel out of place, which affects the overall experience and quality of life at the college. It might help if they brought in more faculty from different regions, especially those who speak Hindi.