Why should teachers be allowed to give pop quizzes?

Ugh, my calculus teacher always give us pop quizzes! We never know when we're gonna have a quiz! We just walk in to class, and he says, oh, you have a quiz. And I'm like what?! But I didn't study! Then I end up failing the quiz because I didn't remember what we learned. So why should teachers be... show more Ugh, my calculus teacher always give us pop quizzes! We never know when we're gonna have a quiz! We just walk in to class, and he says, oh, you have a quiz. And I'm like what?! But I didn't study! Then I end up failing the quiz because I didn't remember what we learned. So why should teachers be allowed to do this?
Update: But I do my homework! The quizzes he give is like from stuff that we learned 2 weeks, and then I remember the stuff that I learned the day before!
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