Start with pathoma and sketchy. This will surprisingly teach you a lot of phys. Start with UWorld Day 1 of studying, 10-20 q's a day. It seems like a waste but it really isnt in the long run. This teaches you how to apply pathoma and sketchy into clinical scenarios. Start off grasping big picture things (i.e. what is left vs right sided heart failure) versus getting into the fine details too fast. Supplement your UWorld with first aid, i.e., read the page on first aid that correlates with your UW question and find what one resource has that the other doesnt. Take notes how you do best with (I did one anki card per quesiton). After finishing sketchy/pathoma do 40 questions/day and build up to 80 questions/day after another month or two. Take NBMEs starting about 6-7 weeks out once every saturday and treat it like a test (i.e. take it at 7 AM, get good rest before, no messing around during the NBME). Find what your weak points are and attack them. UWorld is not a testing tool, so dont get upset about your percentages (for reference my first block was <30% and I ended up scoring mid 80s so dont get too pent up over this). Good luck!
PS. AMBOSS is nice but its was too dense for CBSE. It almost seems like theyre going out of their way to be the "super hard" testing resource. Go with Uworld and use AMBOSS in med school for STEP 1/2