In the Genso era (in Tang), Genso coveted Horoku (法籙), from Shotei SHIBA to become Taoist emperor, wrote a commentary of "Dotoku-kyo [道徳経]," established Sugengaku (崇玄学) (a school for Dokyo), and made the status of the persons who passed the test there equivalent of that of those who passed Kokyo (貢挙), (called Dokyo [道挙]).
玄宗(唐)の時代には、司馬承禎から法籙を受け道士皇帝となり、自ら『道徳経』の注釈書をつくり、崇玄学（道教の学校）を設置してその試験の合格者は貢挙の及第者と同格とされた（道挙）。