I am from the US, and we have the same issue here. There is no accountability and the inmates are running the prison. Somehow, kids have to care about school and what happens to them, and this seems impossible given the fact that they are in a situation they hate (usually) and their folks are working 2 or three jobs and never home.
Getting teens where it hurts, like taking away tech or friend time seems to work, but you need parents for that.