When you complete an exam, your results appear, including your score. However, you can also review your exam results at a later time from the dashboard.
From the dashboard, click the My Activity tab, then click the Completed tab.
You can filter this list to show only exams by clicking Filter below the list of content type.
The exams you have completed appear as a list of cards. At the bottom right of each card is a Show Sessions link. Click that link to expand a list of the times you have attempted the exam. You can click View Results for each session.