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Reminds me of this skit: http://www.cc.com/video-clips/acaxis/key-and-peele-the-heist

I may be dense here, but what's the difference between a cheat sheet in your head and actually knowing the topic?

That's the point of joke/anecdote. By studying you know the material and don't have to cheat, but the "tip" is voiced by someone more accustomed to cheating than studying, and so it's framed as a dishonest strategy.

That's the joke he referenced. Although there is a difference between knowing something and memorizing answers.

Knowing canned answers vs being able to come up with it yourself.

Well, thank you for your (intentional?) kindness, but back then I did sort of misrepresent how well I understood the language.

this happens in an episode of the simpsons except he studies on accident by getting locked in a closet.