Most commonly this person is called a "proctor."
Proctor
Students
Tejano
Possessed...?
an exibitionist
A group of students is called a class.
A wrong number is a number misdialled by a person during a telephone call - or a telephone call from an unfamiliar caller.
religious studies students
Class
Proctor or Invigilator is the name of the person who watches students in an examination.
it's not really mean younger people but in japan, call older people senpai and call younger people kouhai.
Law students