I don't know if it will hinder you from passing or not. If you're behind, you'll have to take the extra time to catch up. If you can and will do that, then you'll be caught up and have no problem. If you don't...you could sink.
I took A&P 8 years ago as an elective science with no idea I'd be using it in nursing school
later. Meaning I remember jack squat. When people start naming off bones and muscles as reference points, I just stare at them and nod lol.
Then I have to go home, pull out my books, and relearn all the stuff everyone else knows. On the bright side, it's much easier to re-learn everything than it is to learn it for the first time, and once it's done, it's done. We use all that info so much, it's easy to keep. Except the names of the bones and muscles. I don't have the time or patience to go through all that again! I just use my little pocket guide the rare times it's imperative that I know something.