Same thing as OCS, basically you are stuck in some room with nothing to do but work all day. It stands for in-campus suspension.
Well, it still pales in comparison to my school's last resort punishment, it's called CHOICES and it's essentially solitary confinement for the whole school day.
I'm just saying all I know about it, and that's it. And I know that at my school, if you miss enough detentions, thanks to our cumulative punishment system, you can be held back.
I can't get detentions. In Sixth Form, I think they're more flexible about when you're punished, but if you over-step the line, rather than punishing you they'll just completely throw you out. So yeah.