First off, SDN is split into two different camps in regards to step 1 prep. I'm part of the camp that recommends starting UWorld early and using it as a learning tool. That's what I'd suggest you do rather than thumbing through first aid and trying to learn from it. First Aid rarely teaches you anything, it only helps you remember stuff by keeping things all in one place and maybe sometimes explains something that was missing from your school's course notes. What teaches you is using your school's lectures/notes as well as doing UWorld while spending time reading explanations. I know I'm only one guy on the internet but now is exactly the right time to be starting UWorld as a second year. In fact, waiting until Christmas break or even January would be a great time as well.
Now to address your question:
Looking at First AID is not a good measurement tool for areas of weakness because I don't think we are the best at self assessment of understanding by just reading. The only good indicator is NBME comprehensive exams and UWorld (only if you do all of it mixed and in a matter of 4-5 weeks or so which no one ever does). Frankly the NBME score reports aren't the best either because you just may not be good at the understanding the way one exam is testing respiratory for example. My advice for targeting weaknesses is to wait until you have a few NBME data points and then target things from there. This may very well be 1-2 weeks from your real exam but realize you're literally sitting there with completely free days. I used to think Repro was a weakness for me because I was always unsure of all the embryo/etc because of all the details in FA I thought I was not remembering, but it ended up being a consistent strength. For me I was consistently weak in Neuro (even thought I went thru it a lot in FA and thought it knew it well) and biostats so focusing on understanding those helped on the real deal.
Lastly to speculate a little, if your curriculum was anything like mine, you've listed 2/3 of the courses (the other being anatomy) that were thought in excrutiating detail that now seem like a long time ago which is possibly why you feel weak in them. I would caution you that neuroanatomy and biochemistry aren't tested in the ways you'd think (brainstem nuclei and cerebellar pathways won't be tested and neither will steps of glycolysis). For neuroanatomy they love to test stupid things like foot drop/peroneal nerve and reflexes as well as opposed to the functions are areas 5/7 in the brain.
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