My $0.02:
For M3:
- Where do you do rotations? All in one hospital system, or varies? Where do you do outpatient rotations (private practice vs resident clinic, etc)? How many away (away from home institution) rotations are you required to do?
- How much flexibility do you have in selecting the services you rotate on? Most schools require that you do Surgery, IM, Peds, OB, etc, but can you choose to rotate on Trauma surgery instead of colorectal surgery (also, how many services are there) or stroke service vs epilepsy on Neurology, etc?
- How much exposure to subspecialties do you get (for surgery, neurosurgery, urology, ortho, etc; for medicine/peds, pulm, cardio, endocrine, etc)? If you only rotate on the general services, how much exposure do you get to subspecialty patients (on peds wards, do you take care of the cardiac kids, the heme/onc kids, and the endocrine kids, or just the general peds ones? On IM, is there a separate service for cardiac, pulm, GI, or are they all on the same team)?
- How do you decide the order of rotations? Is it a set order and you pick what you start with? Is it predetermined? Can you do things in whatever order you want?
- Outside of the core rotations (IM, Surgery, OB, Peds, Psych/Neuro), what 'electives' or other specialties do you rotate on during third year?
M4:
- How long is the year? (this pretty much goes back to how long the first two years are, because often if they're shortened, the extra time gets added to fourth year) When does it start?
- What are the requirements you need for graduation (how many AI's, any other elective requirements?)
- How much time off do you get, and how is it scheduled?
- What sort of electives are offered?
- Can you make your own electives?
- Are international electives available, and if so, what sort of funding is available for them?
Some of these questions may matter to some people more than others, but it's still good to know about them across different schools.