せいと

• elementary, intermediate, or high school student
• school
• My older brother isn't a middle school student, either.
• Neither I nor my older brother is an intermediate student.

がくせい

• college student
• elementary, intermediate, or high school student
• school
• My older brother isn't a middle school student, either.

ちゅうがく

• intermediate school (U.S. middle school or Jr. high)
• college student
• elementary, intermediate, or high school student
• school

こうこう

• high school
• intermediate school (U.S. middle school or Jr. high)
• college student
• elementary, intermediate, or high school student

ちゅうがくせい

• intermediate school student
• high school
• intermediate school (U.S. middle school or Jr. high)
• college student

こうこうせい

• high school student
• intermediate school student
• high school
• intermediate school (U.S. middle school or Jr. high)

ちゅうがくいちねんせい

• 7th grader
• high school student
• intermediate school student
• high school

ちゅうがくにねんせい

• 8th grader
• 7th grader
• high school student
• intermediate school student

ちゅうがくさんねんせい

• 9th grader, freshman
• 8th grader
• 7th grader
• high school student

こうこういちねんせい

• 10th grader, sophomore
• 9th grader, freshman
• 8th grader
• 7th grader