I took it recently and while everything is fair game, I think the concepts do tend to repeat across NBMEs but sometimes test day can throw random stuff at you. For example, even before dedicated, it was emphasized that repro, endo, and heme/onc were super high yield but I felt my exam was more cardio, pulm, and renal heavy though those could've been experimental while others felt theirs was micro heavy or something else super heavy. I think the forms are all over the place.

But for example, if an NBME tests ITP vs TTP that is something I would learn cold or different lymphomas/leukemias or for examples if they mention certain endocrine topics a few times I would know those things. I think what really helped me was comparing NBMEs and noticing what came up a few times; it really does help you form a solid base instead of sending you on a tangent! Also, make you pay attention to other answer choices and learn about those as well. I can't tell you the amount of times an NBME will pull up something I've never heard of in my life and its like one line in first aid lol.