Answer:

popquiz

Answer	Crossword Clue
POPQUIZ	"I listen to Madonna and Britney Spears, so I'm not worried about a ..."
POPQUIZ	You might be unprepared for it
POPQUIZ	Classroom surprise

POPQUIZ	Student's dread
POPQUIZ	It may make a pupil shrink
POPQUIZ	Student's surprise
POPQUIZ	It's given without warning
POPQUIZ	Student's worry
POPQUIZ	Classroom groan elicitor
POPQUIZ	Unanticipated questions?
POPQUIZ	Questions of surprise?

POPQUIZ	Classroom surprise [15][16]