I would rank the courses as follows
1. biochem - definitely covered and covered early in med school. also strongly recommended by many med schools
2. A&P - anatomy (which i have no experience with) is supposed to be brutal, physiology is great to have a background in. physio is recommended by some med schools
3. Immuno - covered in med school, good to have a background in
4. Viro - covered to an extent in med school, I don't want to generalize so i'll just say that at my med school it is taught in the same course as immuno and other pathogens so an undergrad course could go more in depth
5. Developmental - not high yield on STEP 1 i believe? (correct me if i'm wrong) and one of the topics least emphasized in your first two years.
In general, undergrad courses have less of a clinical and more of a molecular focus - i took biochem, physio, immuno, and viro during undergrad, and those that i have covered in med school have had much less to do with molecular biology and underlying genetics, and more to do with clinical relevance. two different flavors of a topic - don't think things will be too redundant