Sundai Preparatory School (駿台予備学校, Sundai Yobigakkō) is the oldest[1] extracurricular college-preparatory school in Japan.

It was founded in 1918 by Toshiharu Yamazaki (山崎 寿春 Yamazaki Toshiharu), a Japanese English Literature scholar and a graduate of Amherst College, Harvard College, and Yale University (Graduate School).

[2][3] Along with Kawai-juku and Yoyogi Seminar, it is one of the three largest groups of preparatory schools.

[4] Admission is competitive, and students must receive satisfactory grades in national examinations to enroll.

[5] These subjects are all required by top-tier universities in Japan.