I realize every school and class is different, but my class? First year most of us got along great, everyone helped each other, was at least friendly to each other.
I'm going into my third year now after this summer, and second year, everyone had their own group of friends and study buddies, and people got competitive and there was a good amount of backstabbing going on. No one really seemed interested in helping each other out anymore, if they were not in their clique. So, lots of drama in my class!
As one poster said above, I've made some lifelong friends, but I couldn't care less if I never saw half the people in my class again after graduation.