noun
summer school
Refers to a school or program held during the summer, often for supplementary study or special courses.
夏期学校に参加して、数学の補習を受けた。
I attended summer school and took supplementary math classes.
夏期講習 specifically refers to a summer course or lecture series, while 夏期学校 is a broader term for a summer school program.
Compound of 夏期 (summer period) and 学校 (school).