Advantages of Exams
Exams value your memories and your skills and ability to understand what you are studying. They make you prepare before hand and, if they are unseen, they make you cover a lot of topics as you do not know the questions. They also force you to be specific and focused, as time is limited in most exams.
Examinations test a student's knowledge and understanding of a particular subject. They bring questions from an entire module together in a challenging environment.