What's one to do in the event of a tie in that class test? I got 13/13 for two classes. I'm not sure what to do here :<

If you got a tie, really, read both descriptions! See which one you think is more ‘like you’. If both sound very much like you, you’re free to choose them based entirely on the outfit’s looks or the powers, as well. People are complex and not really able to be divided into 12 perfectly neat and different Archetypes. There’s overlap, there may be things not talked about. In a case like this, follow your heart.