And there are some who will fail for one reason or another. It's not enough just to take up space in a classroom. You must do the homework, classwork, and pass the examinations. It's the only way to learn academically. Oral and written tests have been around a long time.
Empty barrels make the most noise.
And empty heads do not make a responsible citizen. Today is the Feast of St. Michael and all the Angels. They were not created to enjoy the Beatific Vision immediately. They were put on trial. A number passed and a number failed.