Preparatory School of the University of Tokyo became the First Higher Middle School within District Number One (the Kanto region and the areas around it), and it later became the First High School under the old system by the Higher School Order.
東京大学予備門は第一学区（関東地方およびその周辺地域）の第一高等中学校となり、その後、高等学校令により第一高等学校(旧制)となった。