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For example, if you set the number of attempts on a quiz to "3" and a learner fails all 3 attempts, you can allow him/her to re-attempt the quiz without deleting their old attempts.
Step-by-step
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Guide
To increase the number of quiz attempts for a single user:
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Go to the quiz in question
Click on the cog wheel near the top right of the screen, and select "Group overrides" (see screenshot below)
Click on the "Add group override" button
Next to the "Override group" label, search for the group in question
Specify which override you'd like
Using the example above, if you wanted particular group to have 4 attempts instead of 3, you would set "Attempts allowed" to "4" to allow all the users in the group to attempt the quiz one more time
Click on the "Save" button
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Important Notes
When overriding restrictions on a quiz, it’s crucial to understand that any future changes to the quiz settings will not affect the user with the override. For instance, if the instructor extends the quiz deadline for all learners, this extension will not apply to users or groups who have an existing override. If a user is unable to access a quiz, it is recommended to check if the user's access has been overridden.