If you learn Pharm well during second year FA will be enough. Step 1 tests mostly mechanisms and common side effects and common uses of meds.
I'm blanking on the name of the Immuno book now(no sleep last night and on call tonight 😡 ..its actually just a 40 page section in a Microbiology book I think by Jewitz or something like that...the book has a gray and orange cover..people on here mentioned it a lot. When I remember the name, I'll let you know.