Impending exam

I have an exam in about 45 mins. It's only worth 10% and while it might be difficult to do extremely well on it, I'm fairly confident that I'll at least pass the test. The subject has a requirement that you need to achieve a non-zero score on all assessment pieces in order to pass the subject. I doubt it'll be difficult to do that in this case as it's an open-book exam with 100 questions, 80 of which are true/false statements, so surely I'll get at least one of them correct. I had the first of our 3 practical tests for this subject, with each worth about 8% and I scored 100% for this prac test. It wasn't at all difficult.