"exam room" is correct and usable in written English.
You can use it to refer to a room in which exams are conducted. For example: "The students gathered outside the exam room, preparing for their tests."
Poverty is an exam room familiar.
Later outside the exam room, the son pulled me aside.
In the Exam Room: Seeing her now, I was more than frustrated; I was worried.
But the presence of computers in the exam room has had another consequence.
The doctor disappeared from the exam room and returned with a basin of water and ice.
Even alone in an exam room, we hear a chorus of voices appraising, evaluating, passing judgment.
Writing and reading still carry with them the faintest odor of the exam room.
When Dr. Lesser entered the exam room, he was struck by the patient's deep-set eyes.
In the exam room, a technician asked her to lie down.
We entered a small exam room with a commanding view of Cambridge.
But after the girl slipped into the exam room, the nutritionist closed the door.
