Middle School Student
Junior High School Student, Middle Schooler, Junior High Schooler, Junior High Student
You've seen 学生 (means student). Now let's look at a student who's in the middle. Perhaps we can call this a middle school student or a junior high school student, depending on where you're from.
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.
My child is a junior high school student now.
I participated in a junior high school composition tournament.
Oyama-sensei is my teacher from when I was a junior high school student.