Because staying in the same grade for three years meant expulsion from school, it is said that there was a student audacious enough to 'deliberately' repeat the same year once in each grade of the three years in advanced course, staying in school for six years.
おなじ学年に3年とどまると放校（退学）となるため、「計画的」に高等科3年間の修業年限を1回ずつ落第し6年いつづけた猛者もいたという。