To reset a user's progress in a course, visit that course and navigate to the Users tab.
Check in the user (or users) you want to reset his (their) progress in the course from the select column checkbox (1) and then click on the With selected option (2).
A pop up window will appear with various options. In the Progress option (3) you will see the following:
- Reset: which reset the progress of the user in the course
- Reset and revoke certificate: which again resets the progress of the user in the course but also revokes any certificate he might have in the course.