Related Clues:

• Lab act
• It's often taken in silence
• Grade determiner, often
• Mike holder's opening, often
• Regular duty
• __ paper
• Part of 16 Across
• Milking the cows, e.g.
• Set of questions
• Work that's no fun
• 'Perry Mason' scene
• Occasion for a blue book
• Class grade factor
• Quiz or exam
• Part of SAT