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It may be that only your overall grade is available (in the column on the right.) But if your professor indicated that you can see things like the quiz/exam questions, and your score for each, click the "Attempt" link on the left.
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If your professor has provided feedback on your answers to individual questions, you will see a link below the question and your answer:
Click that to expand and read the professor's feedback.
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Different professors use the quizzes tool differently, so the information that's available, and when it's available, may vary from course to course.
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