I know this movie is hugely exaggerated , but there are many similar movies about american school warzones .
I just cant imagine anything remotely like this happening in Europe.
must be the mandatory school uniforms
There are several mentioned here.
https://moviechat.org/tt0083739/Class-of-1984/58c73d856b51e905f66c7eb8/If-u-liked-this-u-will-definitely-love
yeah , pretty comprehensive list.
I remember one movie where one of the students casually executes a rival for painting over his graffitti , I think it was "187"