None of them. Films always portray high school as a hell on earth were talking to someone who was not in your clique was frowned upon, when in reality, high school isn't that bad and definitely not as segregated.
Non of them are realistic. And they all have the same plot The nerd/new kid gets picked on my the jock/popular kid then the nerd/new kid challenges the popular at some major high school event and comes out triumphant and wins the respect and love or the popular kids.
My favorite one is "she's the man" which is very unrealistic.