The Life Sciences guide from ArtSci pretty much outlines everything you'll do as a pre-med
Life Sciences Guide | The College | Arts & Sciences
If you major in Biology or Chemistry, then most of the pre-med classes will count towards those majors. That's why most pre-meds end up majoring in one of those two fields.
Wash U really encourages you to take Bio III and two semesters of Physics and one more calculus class than you might find at other colleges.
You'll take Chem 1 in your fall semester freshman year, and Bio I and Chem II your second semester. I think this schedule is one semester more advanced than many colleges' sequences. The thing about Wash U is that they introduce some stuff in the intro level chem courses, which is most always reserved for more advanced chemistry classes elsewhere.... so placing out of Chem 1 here will be to a severe disadvantage and no one really does it. The benefit is that you'll be extra prepared for organic chem and med school!