This article explains how you know if a learner completed a course.
At this time, the learner progress report does not include the status of course assignments, including individual exams and open-response assignments. Student progress can be found Using the learner progress report
Admins are welcome to check directly with a learner to inquire about the completion of any specific assignment, which can be found on the learner's individual course progress page.
For more information or assistance with how you know if a learner completed a course, submit a support ticket to enterprise-support@edx.org, or reach out to your account manager (where applicable)