The brain is an exotic learning machine, to put it mildly. It does not take orders well. You can tell it to remember the major players in the settling of Manhattan, stress how crucially important that is, and on the test a week later very little comes back. And yet you might remember nearly every play in the San Francisco Giants’ Game 7 World Series victory. Why? Because the brain doesn’t listen to what you say; it watches what you do. And thinking often about Madison Bumgarner pitching, talking about the game, arguing about it: These are mental actions, as well as subtle forms of testing knowledge.
New York Times article on how test-taking helps learning.
Author of Economics: The Remarkable Story of How the Economy Works