Started studying in the middle of June.
Took test middle of Aug.
A month is more than enough time to study, given that you study a lot during that month and not really goof around or procrastinate.
All you need is the RxPrep book. Others use APHA or Kaplan or PassNaplexNow. Can't rep those other 3 sources but I highly recommend RxPrep. Gives you the facts that are important and in an easy layout to be memorized.
You can opt to take the 2 pre-Naplex tests.
I suggest one 2 weeks before test and then another a week before the test.
Don't need to buy the online courses for RxPrep or the question bank it offers. I highly recommend not wasting money on the question bank, waste of money and time.
There's a source floating around one of these topics with math questions. Study that to the best of your abilities. Study it, study it, study it. That's all.
Good luck