Boeing 727277, been there done that. You're very close to a pass so use this time to really get up to speed about how to pass that exam. Firstly, just take a week off. Clear the cobwebs, go to the beach, watch a funny movie (Deadpool is spot on for that) etc.
Time to change your mindset. If you say you'll do poorly in an exam, you will. If you say you hate exams, well... you'll be battling that all your career. Perf is a bastard of an exam. You might find more info over in the Dununda Forum about specialist coaches for this exam.
Your exam record may have an impact if you're going for a highly sought after position, but no one will look at your exam results if you're going to fly a C206 in the bush. No one will give a stuff. Once you get some experience, no one will care about your exams. The main questions a recruiter thinks about for an airline is "does this person fit, are they a muppet in the sim, can I sit next to them for 8 hours without wanting to jam the crash axe in their head".
Good luck