I'm pretty sure your school will know who passes and fails. I don't know that they'll do anything. Probably not. They might frown a little because you brought down their first-time pass rate, but that's nothing. I think my school lets you go after three fails. They give us three months to take it, so that seems fair. If you fail, there is a breakdown of your scores with it. If you pass....it just says pass. I just wrapped up D1. There wasn't whole lot of material that was new. I guess our first year is focused on NBDE I, so they did a good job, I suppose. We didn't cover abdominal vasculature very well. That part was new'ish to me. I only did 200 cards. I hated them, so I stopped. I studied almost exclusively with old tests. Yes, I identified ~30 repeats after my test, but that's not the value of the old tests because you may not have many repeats. I can promise you'll have reworded questions though. It's understanding that material and knowing why answers are right and wrong. It's so similar and wording is on par. The decks have WAY too much info in them. Classmates were getting ~60% on old exams. And pretty much everyone walks out feeling defeated...but you see the national average...people obviously pass. Very few don't the first time.
Have you covered dental anatomy & occlusion much yet? That's the gold. You can rock 80+ of those questions and get 55-60/100 on other sections and pass. Dental material is so much more straightforward. Have you seen the 'Everything You Wanted to Know About The Shapes Of Teeth But Were Afraid To Ask' documents? That's a great summary of everything dental. I read that the morning of the test to review. If you're going to bother finishing decks, blast through them! Only really read bold words or look into stuff that you absolutely don't know. I was taking too long and it was too much info, so I stopped.
Also, if your timing is okay, I wouldn't take full tests at this point. If English is your first language, you should be okay for time. Rather, use your time to study over practicing at this point. Did you use Destroyer for the DAT? First Aid Q&A is like that, but the questions didn't seem on par. But dentalarticles.com/nbde/ is great. Multiple choice questions in all 4 categories, but it has explanations with the answers, kind of like the DAT. Also, gather some mnemonics. Those will get you through multiple choice questions...especially biochm if they ask what product comes after what in some sort of cycle. Like, what immediately precedes urea in the urea cycle.