You’re going to get a lot of different answers about this and I think some of it is going to be school curriculum dependent. Also with your class going to P/F I’m not sure how that will change the game, I will let others comment on that.
BnB you can start with your class material since he’s got everything on there.
UWorld don’t even think about that yet
FA I’d say you can get now to get a feel of how it’s formatted and it will cover mostly everything you get from the start of first year
Pathoma when you start doing path or path of systems. I’ve seen schools set up differently with curriculums so this will vary
Sketchy you can start around the time you start getting micro and pharm. I’d say Sketchy path is a waste, pharm is good and micro is absolutely ridiculous. Looking back, my micro background was nil so I would have started this earlier because the content is broken down so well and actually enjoyable.
I’m just a 2nd year so there will be others more knowledgeable than me who already took boards that will comment as well. Make sure you nail class content too to really figure out your learning style as well. Class content at the very start will help you understand the pace of med school and honestly was the most difficult part for me to adapt to. It took me longer than most but now I feel much better about what’s thrown at me.
Best of luck and don’t become discouraged by what others are doing.
You know yourself better than anyone and know what needs to be done.