Once upon a time, a boy with no magical powers managed to get into magic school by cheating on the test. After he was admitted, he studied hard and learned all of the magical incantations by heart, even though nothing out of the ordinary happened when he spoke the words aloud. Whenever a test came around, he always found a way to pass it by performing regular, non-magical stage tricks: pulling rabbits out of
hats, guessing people's ages, and so on.

Eventually, the school headmasters discovered that the boy had no
powers and kicked him out of the school. He wasn't a true wizard, after
all. the boy had spent three years fooling real wizards into
thinking that he had powers, so that by the time he was expelled, he
was already the greatest stage magician in the world.