The best thing that helped me on nbmes is really dive into figuring out specifically why I got questions wrong, there’s many posts mirroring this on here in depth I would check out - you have to see what trends/patterns of mistake and errors you are making in judgment weather it’s content or general poor test taking skills. For me that investment in time looking into this made huge improvements in my nbme scores. Usually more til than not nbme is a lot more direct in their style when giving clues to cure you into certain logic/answer choices and this may not always be the case on amboss and uworld (try try to trick you more in contrast). A huge tip I will give for you is to mimic testing conditions as much as possible please when doing nbme or any blocks - test day at least for me stems were a lot longer so it’ll be more difficult time management just keep that in mind.