There are currently methods for modifying the number of attempts by individual quiz. I suggest a method by which an instructor may modify all quiz attempts allowed for a single student to be applied to all the quizzes.
Hello, Richard Halliburton Welcome to the Canvas Community! Are you using New Quizzes yet? In New Quizzes, the instructor can add extra time for a single student across all quizzes by following the instructions that start in the Select Time Adjustment section of How do I add assessment accommodations for a student in New Quizzes? You'll find resources in the User Group: New Quizzes that will help you get started with the tool if you haven't started using it yet.
There is not currently a feature in New Quizzes that allows an instructor to add attempts for a single student across all quizzes, however, so we've opened this idea for voting. You might also be interested in this related idea requesting an enhancement to the quiz moderation feature in New Quizzes: Select multiple students in the quiz to add attempts
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