I'd also like to point out that the only ones to involve a classroom in any capacity this season were the first 3 episodes. And with the possible exception of "Advanced Gay", they were easily the worst ones of the fall semester episodes.
Don't worry though. I know of at least one class-centric episode coming up that has quite the promising premise.
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"One toot on this whistle will take you to a far away land."
-Toad, SMB3