Junior high school students: junior year? Tall? School? student
High school students: seniors? Tall? School? student
College student: University? student
Freshman: Freshman
Sophomore: Sophomore
Juvenile: juvenile
Senior students: senior students
Undergraduate course: undergraduate course? student
Bachelor's degree: Bachelor?
Master student: graduate student/graduate student? student
Master's degree: Master.
Doctor: Doctor? student
Doctor degree: doctor.