You can view Submissions for a particular Exercise two ways.
You can view Submissions from your Exercise's Reports. To access your Reports, select the relevant Exercise and then select Reports located at the top right corner of the page.
The Report titled Submissions includes a link for you to view each Submission. Select the Learner's name to view each Submission.
You can also view the Submissions report directly from an Exercise. Simply visit the relevant Exercise and click on the number of Submissions listed directly above the Challenge stage.