noun
support school for correspondence high school students
A private institution that provides supplementary classes, guidance, and a study environment for students enrolled in correspondence high schools (通信制高校). Not an accredited school itself.
See also: 通信制高校
通信制高校に通いながら、週に数日サポート校に通って勉強している。
While enrolled in a correspondence high school, I attend a support school a few days a week to study.
サポート校では、通信制高校のレポート作成を手伝ってくれる。
At the support school, they help with writing reports for the correspondence high school.