Get the book the class uses and read through it before the class starts. study the bone, muscle, vessel names, focus on the blood cells, electrolytes and glycolysis. if you understand that (glycolysis krebs cycle and the ETC) you are way ahead, lots of great youtube videos on these subjects.
I also like the incredibly easy, incredibly visual series of books, i got a bunch of them at goodwill for cheap. but amazon
has them. the pathophysiology visual and easy as well as the fluids and electrolytes books are really good. Fluids and electrolytes you want to know inside and out for nursing school, know the causes and s/s of electrolyte imbalance and how fluid shifts occur
Netter's clinical anatomy is a good pocket guide. Many schools suggest an optional coloring book, does not work for my style of learning but if that is for you, go for it.