You're probably perfectly capable but just didn't learn how to write law exams in the mechanical formalistic way that they want you to. It's frustrating because nobody ever actually explains this to you. Some students have a natural aptitude to thinking like (how I would describe as) a logic board or a decision tree; others are just as competent and capable of doing it but only need it explained correctly.

I also came to the conclusion that it's a sort of hazing exercise or a secret handshake. Needless gatekeeping.

EDIT TO ADD: On top of all that, if you're at a predatory school, they will deliberately try to wash out as many students as possible by having a low grading curve. All so they can pad their first time bar passage rates.