Well . . .
I don't have good news, but I appreciate people being honest with me, so if you don't like the plain truth, don't read this.
I have had three friends to fail their first time. Two of them went back and took the whole class over. I think they would have let you come back in just at test time only, but they opted to hear the lectures again. The second time around they did fine.
I wonder, though, how much they truly applied themselves.
My personal trainers certificate is through NFPT. I passed on the first try, but I'll have to tell you that it was harder than I expected. I'm so used to AFAA and other places making you study tons of stuff, then when you get there, they only test you on the basics. My personal trainers test was not that way. It covered all the enzymes and amino acids and nearly blew me away.
I know this wasn't what you wanted to hear. BUT YOU CAN DO ANYTHING YOU SET YOUR MIND TO. Make your best attempt, and if at first you don't succeed, try, try, again!!! The world will not come to an end like we sometimes think it will.