noun
cram school; prep school
A private after-school institution that prepares students for entrance examinations, typically for middle school, high school, or university.
彼は放課後、進学塾に通っている。
He attends a cram school after school.
進学塾の授業料は年々上がっている。
The tuition fees for cram schools are rising year by year.
A preparatory school, often for students who have already graduated high school and are preparing for university entrance exams.
Compound of 進学 (shingaku, 'entering a higher-level school') and 塾 (juku, 'private school').