For Recent Test Takers- Please help me settle my expectations of going into the exam, and a possibly (irrational?) fear that's hanging over my head.

So I'm a week into dedicated. A little rusty, but we're dusting off all the stuff we've learned over the past year or two. I'll say I felt like most of the Shelf exams were reasonably fair, and usually felt harder than they were based on how I scored. UWorld usually feels like a deeper dive into questions than what showed up on the shelf exams, and can pursue some more of the rare things that I didn't see on those, but overall were a good framework. The NBMEs were mostly good, sometimes they felt like they were a little too "dumb" and that could catch me off guard (things where the answer was "duh, I assumed that was already done because it's so standard). All of this is to lead to, I feel like Shelf material has all been fairly straightforward. If ____, then _____. What's the next test to dx? What drug to give? And then some concepts like preload/afterload, ventilation, acid/base, the very basics of some feedback loops etc. All reasonable enough, and usually all the same concepts just being applied in different scenarios (that usually require you to use the same methods), and most of the time, things I saw in real life on rotations.

But, I have this ever creeping fear that somehow, after all this time, with all the Shelf exams, UWorld, and NBMEs not having it, that a bunch of surprise Step 1 material will ambush me out of nowhere. CD proteins, deep dive details of electrolyte transport proteins, tertiary actions of hormone feedback loops, picky onco-genes and fine details of super rare immuno disorders, and all the other elaborate ways of asking questions I either maybe saw just once in a question a long time ago or maybe even I did know the answer to, but in a way that hides behind detail and sometimes vague vocab with unrealistically long question stems. It seems unfounded, because nothing else has been like that, but I can't seem to shake this idea that somehow it'll all come back around. Does it?

I feel like I'm struggling to prepare correctly (and build confidence) when I don't really have a clear expectation of what I'm up against, or what my big take aways should be as I work through material.
What was the exam most like? Uworld? Shelf exams? NBMEs? Step 1? Something else entirely?

Any input or words of advice from people who've already tested would be greatly appreciated. Thank you.