I've been working on positive thinking even if I fail. So, I was utterly destroyed mentally and emotionally last time because I didn't allow myself to think about failing. I failed and it wore me out. Eventually, with therapy, exercise, and meditation, I picked myself up, dusted myself off, built up my confidence again, and prepared. I sat for the exam, left it all out there in the exam room, and I'm still here... not much I can do now.
But this time, I just want to fail forward. If I'm going to fail, I just want to do better than I did the first time on the exam. Think of it that way... you're not starting over, but picking up from where you left off and going farther than before.
Fail forward.
Failure to try is the only failure there is. Keep going.
(Can you see that I'm in this weird "doubt/acceptance of an outcome I don't have yet" phase?)