"Niemożliwe jest możliwe."
Translation:The impossible is possible.
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Actually, not. You are not expected to get 100%. If you take a quiz in October and you fail questions 7, 13 and 24 (because you haven't learned about that yet) and then you take the next quiz in November and you get those questions right, Duolingo now knows that it managed to successfully teach you those things.
That is generally not shown very clearly by Duolingo so I'm not surprised by your comment.