First aid is presented in an outline format (not exactly, but close enough). It really throws together a bunch of disjointed facts. Making matters worse is that these facts tend to be all over first aid too
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It is VERY IMPORTANT to annotate first aid as you go along in your classes. If you do so, then you'll find that your first aid is 'ready to go' when you start your step one studies. If you don't annotate as you go along, you'll be like me- I've just wasted about 4-5 days reading micro made ridiculously simple while annotating the micro (ONLY micro) section. I'll now need about another three days to memorize what I've written in first aid. I also know that all of this wasted time will hurt me in the long run since I will not be able to spend as much time on other subjects as my test date draws near.
With regards to why first aid doesn't include more high-yield stuff- well I would venture a guess and say that if first aid did, it would bear a striking resemblence to whatever micro text you used during your micro class. You can only add so much before the book looks like a text. Also, try re-reading your text before step one and see how much of it you'll remember (probably not as much as you'd like).
Do yourself a favor, annotate first aid during second year. I was told this, and I didn't listen. I am now suffering immensely since I'm wasting a crapload of time annotating instead of memorizing (micro has some understanding, but more of it is really just memorizing). If you are wondering why I'm spending so much time annotating, it is because I forgot so much of the minutae that I learned at the beginning of my second year- and I honored micro and I still forgot much of that crap.
I know one thing though- I'm just memorizing the biochem section of first aid. I mean word for word. I just don't give a crap about biochem and it will probably hurt me, but I'm shooting for the mean