noun
leaving a cram school; dropping out of a cram school
Specifically refers to withdrawing from a 塾 (cram school or private tutoring academy), not a regular school.
成績が伸びず、夏期講習の前に退塾を決めた。
My grades didn't improve, so I decided to leave the cram school before the summer course.
退塾する場合は、前月までに申し出てください。
If you wish to withdraw from the cram school, please notify us by the previous month.