One of the best ways to grow and be involved in your own learning is to review your assignments and exams after they have been graded. From detailed comments to a simple mark of correction, that feedback is valuable.
You can review your exam responses after your final attempt on an exam at any time. Note that in most courses you have two attempts on the first exam. Therefore you cannot see your responses to the first exam until you have taken it a second time. All exams after a course's first exam can be reviewed immediately.
You should also review any feedback given by your teacher. If you have questions about your exam, or about how or why you lost points, please contact your teacher.