The moment you enter the college and attend classes initially, chances are that you may come across certain seniors from 2nd year who might lecture you. It would mostly be about how you should avail NIT buses/wear formals/regularly attending the library and so on.
Talking about rules at NIT Jamshedpur, you must understand that following every rule is not that necessary. Acknowledge what has to be followed and once you spend a month or two, you will get an idea yourself. In case you are still a bit skeptical, feel free to check out the instruction and rules that the college follows on its website.