Questions. Questions, questions, questions!! read BRS or RR for 15 - 20 minutes, annotate quickly into FA, do 45 minutes of questions from Rx or Kaplan. rinse and repeat. it's nice if the questions come from the same subject as what you just read, but doesn't have to. you have to start somewhere. start with 50% questions, 50% reading, then adjust according to your proficiency. as test day approaches, more questions, less reading, do UW last (but make sure you have enough time to do it once and then repeat all the ones you missed).
or you could annotate everything into Anki, using FA as a skeleton. time consuming but you have total control over the content.
gunnertraining.com is another good resource, although i hear it's not as good as it used to be. you can get a four week free trial and see if it's worth investing in.
the reason everyone uses FA is because it's the one-stop-shop for all the most relevant topics. it is possible to score well with just FA & UW, but for that to work your baseline retention from MS1/2 has to be pretty high to start with, and that's not everyone.
but really it was all about call and response for me, which was why questions were so important. when you read "NSCLC," your brain should instantly puke up "central, smoking, nesting, keratin pearls" etc, without thinking about it. it has to be that reflexive.