When you complete an exam, your results appear, including your score. However, you can also review you exam results at a later time from the dashboard.
On the dashboard, click the Activity tab and scroll down to the Completed Content section. You can filter this list to show only exams by clicking the Exams icon in the navigation on the left.
The exams you have completed appear as a list of cards. At the bottom of each card is a Show Your 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.