in GED Practice Tests

Ok, since it seems there is literally no discussion about this question on the internet... anywhere... I guess I will start one, and hopefully get a quick response as my math and writing tests are tomorrow morning!!!

I just took the practice test, without any studying, and I haven't been in school for over 8 years now, and I got an 89% average, I haven't taken the time to break down the averages for each portion, but for example I only missed two math questions, & one of them I simply didn't realize I selected the incorrect formula to express the statement as an equation. Can I take a chill pill now, because although I never thought I would be nervous to take the test, I'm realizing that I am.

Thanks in advance for any response

I know that it's more complex than just saying you have to get 65% of the questions correct to pass, but should I be confident that I will pass without much hesitation?