Related Clues:

• One held for questioning
• Licensing prerequisite, often
• Try to prove
• Cricket match
• Means of determining proficiency
• Sound check
• Word after beta or acid
• Litmus ___
• Lab act
• It's often taken in silence
• Grade determiner, often
• Mike holder's opening, often
• __ paper
• Part of 16 Across
• Set of questions