So how dose a "in-school suspension" work. You go to school and skip class?
They lock you up in a little room with some hideous gorgon-like creature to watch over you. You're not allowed to speak. In fact, the only thing you're allowed to do is homework.
In-school suspension is usually doled out when detention is deemed too lenient and out-of-school suspension too harsh. However, when I found out I was getting in-school suspension, I would usually do something bad enough to bump my punishment up to out of school suspension, which in actuality is much easier.
The school probably has a specific room where students who are "suspended" from the classroom go and do their assignments for the required amount of time of the suspension.
Makes sense only to a liberal.