Physics B isn't that hard. Sure, you probably won't get a perfect score like you can AP Psyche or something but the curve makes it so a good score isn't that hard to accomplish. I self-studied for two weeks using PR
and managed to a get a 5 without ever taking a class. Calculus is nice to know to more easily grasp some Electromagnetism concepts, but otherwise you won't need it. The calculations aren't too difficult either. The trick is just to practice a lot of problems so you develop a mindset for stuff on the test. It's more about intuition than breadth of knowledge really.