High School, Senior High School
noun
The tall school is for when your kids get about as tall as they're going to get. That's high school, when most people stop growing taller.
こうこう
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
高校まで、車で行けば十分ですよ。
It only takes 10 minutes to get to the high school if you drive.
うちの妹は、今年高校三年生です。来年、大学の入学テストが有ります。
My younger sister is a junior in high school this year. Next year, there will be a university entrance test.
高校の時は、地理や科学のことが、あまりよく分かりませんでした。
When I was in high school, I didn't really understand geography and science.