Overall, there are 28 questions, but you will only answer 8 of them. This may prove useful if you’re convinced you’re meant to be in a different hogwarts house than the one you got the first time. So, if you retake the test, there’s no guarantee that you will even get the same questions.
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The simple answer to the question is no, you can’t retake the quiz if you’ve already taken it on that.
