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 tha

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.