ie Feuerzangenbowle from Director Helmut Weiss is based on the novel by the same name from Heinrich Spoerl and Hans Reimann that has turned into a cult German film. The film tells the story of a writer Johannes Pfeiffer who goes undercover as a student in a high school after his friends told him that he missed out on a great life experience since he was home schooled.

Overview from themoviedb.org