Here's a webseries that will take you back. Appleseed Elementary. In the wide brown land, that would be a Primary school, but this is an American series.
As you've already guessed, there's the eager new teacher, an assortment of burnouts and no-hopers, and a troubled Principal. But there are no psycho nuns with rulers to whack you on your bare legs until you cry, so it looks pretty good to me.
Appleseed Elementary is written by Kirsten Clark and Jerrod Clark, and directed by Adam Siegel. Beyond that, all I can say is, they're not much into explaining their work.
Anyway, here's Episode 1.