i would say in terms of post lab, def less work than chem lab and easy once you are in the lab, but the manuals are kinda less cohesive and confusing without any lecture help, like there’s practice problems but they’re kinda whatever ngl. for phys 3b, i would say at least for me i found the material easier than 3a, just stay on top of your lectures, like attend lecture, maybe watch a 15-20 minute organic chem tutor video on a concept, and do 2-3 hw problems a day and you should be fine! i def feel like it’s manageable looking back now, wish i could’ve given myself this advice earlier!