it's a new song, but it's been played a few times acoustically. you're thinking of the partner songs "what i should have
learned in study hall" and "what i really
learned in study hall". those were done acoustically about 6 years or so ago, during their transition from pop-ska to emo-hardcore. this is just a continuation of those songs, making it a trilogy. i see why you thought that tho. it can get confusing when there's so many similar song titles.
mayhaps there's more to continue the story soon?