A student representative is someone who speaks on behalf of the students. They are chosen to represent the interests and concerns of their classmates to teachers and school administrators. Full definition
The state board of education currently plans to work with the principal's association and state school board association to support programming for student representatives on school boards. (soundout.org)
I became active in student issues early on in my Ph.D. student days when I volunteered to be one of the two student representatives at departmental faculty meetings. (sciencemag.org)
The easiest is creating a small group of student representatives in every class to serve as an advisory council to the teacher. (edutopia.org)