I've never taken anatomy before med school, and I can definitely remember feeling overwhelmed by it (I've been told that anatomy is in some ways, like your first real med school class).
Simply put, as you know, anatomy boils down to basically three things: what is this structure, where does it go, and what does it do? A large part of that is muscle innervations, dermatomes, or blood supply. And this takes a lot of repetition to memorize. But I think most med schools will ask them in context of clinical scenarios. That's why I loved gray's anatomy questions, and I recommend doing as many questions as you can - as most people seem to suggest, pattern recognition is still pretty key and can help with repetition. There are only so many ways that a professor can ask about radial nerve palsy, nutcracker syndrome, or a cranial nerve palsy involving ocular nerves. As you do questions and continue to repeat facts, try to group things together and understand how many of these muscles/nerves/blood present in clinical scenarios.
I did not particularly enjoy anatomy labs (particularly because we had no idea what we were doing as first years, and most of us ended up pretty much butchering our cadaver cluelessly), but I also agree that for lab practical tests, it is in your benefit to see as many cadavers as possible. I didn't spend hours at a time trying to cover everything, but I did it systematically. One day, my friends and I would go to the cadaver labs for like a half hour one day and look at the deltoid/upper arm muscle at like 7 different cadavers, and then get out. Then we would go back the next day for an hour, identify the root of the brachial plexus of 7 different cadavers, and then get out. And repeat, systematically each day for a different part each day. It made it more manageable, and still get plenty of exposure by the time lab practicals came without the need to cram.
It's a brutal class, simply because of the sheer amount of information and details that they can test you on, but I will say that in some way shape or form, most people get through it. So I'm sure that you can too! Hang in there!