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Study hall is a part of a school day. It is held in a classroom and monitored by a teacher, but it is not a class. It is a period during which students do whatever schoolwork they need to complete. That can be doing homework, studying for a test, or catching up on reading. Not every school has study hall, and at schools that do, study hall is not on every student's schedule.
It is likely that:
a) Study hall is the school period immediately before a test.
b) During study hall, a teacher is present but does not teach.
c.) Study hall is held in a hallway.
b.) During study hall, a teacher is present but does not teach.