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Bump because it disappeared off the page.
Sounds like a teacher's version of The Pirates Who Don't Do Anything.
"One Hour Work Week" would be a good fit for this if the issue is the teacher's seemingly unlimited free time. If the issue is that the teacher seems to deal with a single, unrealistically small group of students who seem to function as a collective stand-in for the larger number of students in multiple classes, who a real teacher would deal with, then "The Main Characters Do Everything," or, perhaps, "Economy Cast" might be a better fit.
Edited by wsmith76
School Forced Us Together and Wacky Homeroom for all the interesting characters being in the same class, details varying depending on how the school groups students. (Say, in a US high school all the main characters might have Chemistry third period in room 23-B.) Reasonable flexibility would have this applying from the teacher's perspective as well, conveniently having all their students of narrative significance in one class out of their day, or that period being the focus of the drama because it's the one with all the weird kids in it.
Edited by Scorpion451
Happens all over, but the examples I can think of are LATV. A teacher who seemingly only teaches one class a day, like Mr. Kotter on Welcome Back Kotter, Mr. Moore on Head Of The Class, etc.