All medical schools accredited in the United States have to cover the stuff on the USMLE in one order or another, and it all basically comes down to rote memorization of a very long list of facts.
You could have a school that offers courses such as biochemistry, embryology, histology, anataomy, physiology, pharmacology, pathophysiology, etc., and you would find that within each of those topics, the major organ systems are covered in some order. If you had a school that offers blocks such as cardiovascular, respiratory, gastrointestinal, you would find that within each block all of the diciplines would be covered in some order. Six in one hand, a half dozen in the other.
I personally think that the preclinical years are best designed just the way that First Aid is written if the step exams continue to maintain the current structure. Cover the basic sciences/principles in the first year with the stuff that is low yield for step I. Then turn second year into a systems-based pathophysiology/pharmacology sequence with the oncology, immunology, and infectious processes incorporated into each system.