Failing a test you’re allowed to retake isn’t the end. Not signing up again is.

A result you are allowed to repeat is a piece of information, not a conclusion. The failure costs you nothing permanent as long as the second attempt happens, which means the only genuinely final decision in the whole situation is quietly declining to try again. That decision usually gets made by avoidance rather than on purpose, which is what makes it dangerous. The door stays open until you walk away from it.

Sign up for the retake before you have finished feeling bad about the first one. Put the date somewhere you will see it. Then work on the two topics that went worst rather than revising everything evenly.