1The three-year school students attend after junior high school (senior high school). This is the formal name; in everyday speech it's almost always shortened to 高校.
彼は市内の高等学校に通っている。
He attends a high school in the city.
この学区には高等学校が三校ある。
There are three high schools in this school district.
娘は来年、高等学校の入学試験を受ける。
My daughter will take the high school entrance exam next year.
県立高等学校の授業料は無償化されている。
Tuition at prefectural high schools has been made free.