Answer:
On top of your nursing classes and clinicals, most schools require Anatomy and Physiology 1 & 2, Biology electives, Chemistry, Organic and/or Biochemistry, Microbiology, a math course, Pharmacology and general electives.
General electives that are beneficial to understanding a patient better are typically anything under sociology, anthropology, and psychology.
That's just a general listing its better to look at the schools you're applying too and understand what requirements they have and expect out of you for that program.