Do we need examinations????? why??????

Do we need examinations? Yes, because examinations can improve the knowledge that subject and we can more know went read a book.. Examinations is to make we improve that subject and learn that subject. Went we do the examinations, we can test maid about that subject has learn.. Went do the examinations, we can know what wrong and we can improve that topic.. examinations is most important in school, college and univercity because want to know weakness that topics or that subject....