[ARCHIVED] How to delete questions from on-line exams before grading them

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I provided an online exam yesterday (via Quizzes on Canvas). There were 9 points worth of questions that required looking at images. I made some kind of error & students couldn't see any of these images. I haven't selected SpeedGrader yet, but am wondering whether I can delete these questions before I start grading. I don't want to mess up any work students have already done.