study hall

noun

(in some schools) a room used solely or chiefly for studying.
a period of time in a school day, set aside for study and doing homework, usually under the supervision of a teacher and in a room designated for this purpose.

Origin of study hall

First recorded in 1840–50

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

The opening of the study-hall door interrupted her worried reflections.
Marjorie Dean
Pauline Lester
After this interview, Roy looked a long time out of the study-hall window.
'As Gold in the Furnace'
John E. Copus
Before going to bed on the night of the play I hung my sweater on a peg in the study-hall.
'As Gold in the Furnace'
John E. Copus
Then, noting that the eyes of her pupils were fixed in concerted gaze on the study-hall door, she turned sharply.
Marjorie Dean
Pauline Lester
"I'm sorry to be late, Allan," he said pleasantly as he came through the study-hall door.
The Black Fawn
James Arthur Kjelgaard