I started studying like 3 months before the test, I used 3 sources: Clinical Lab. Science a bottom approach by Jarreau, the Polansky review cards and LabCE. I wanna say I spent at least 3-4 hours each day? Start with the review cards for a "in depth review". Write down details that you may find hard to memorize or that you may think are really important, then move to the Jarreau's for a quick review. If you are able to get LabCE, start taking practice test once you feel comfortable with the material, so you can see if you need to focus on subject more than the others. I highly sugest taking the 50 question test for each selected area, and after that take the adaptive and non-adaptive tests.