Rye

I'm assuming by "senior high school" they mean a high school that only has the latter grades. In some places middle school includes 9th grade, so a senior high school is probably a school that only offers classes for 10th-12th graders.

Thanks everyone! ( ´ ▽ ` )ﾉ

@Akazora In our country, the newly implemented basic education curriculum includes two additional years for high school. Junior High is from 7th to 10th, where all students take the same core subjects and classes, and Senior High is from 11th to 12th, where students will take specialized classes in preparation for their desired course in college.