People took knives and baseball/cricket bats to school plenty where I went but not much bad shit really went down though, it was all just standoffs and the occasional fist fight between about 15 people. The one main time I remember was when one guy in my class just took a knife out in class and started showing his friends (pretty sure he said that if some guy fucked with him he was getting stabbed, not 100% though), the guy was properly mental but always looked out/was nice to me and friends which was nice.
I did hear a kid got stabbed outside the school about a fortnight ago though, so there's that. That's Glasgow I suppose.