> Hackable is the default for any test imposed by an authority. The reason the tests you're given are so consistently bad — so consistently far from measuring what they're supposed to measure — is simply that the people creating them haven't made much effort to prevent them from being hacked.

In proof-based math classes in college, there really was no hacking them. You had to build up an intuitive understanding of the concepts and think on the fly to come up with a proof for a test.

Sure, you could try to seek out "all relevant questions" and memorize the proofs but there's such a large universe of possible problems to ask you'd never have enough time to study this way.