I read this as "What is the bare minimum I have to do to match at a good university program?" Not to bust your chops but Step 1 is your golden ticket to an interview date at a lot of good programs (not all of them, because of your pedigree...but most of them) and if your aim is to achieve an arbitrary minimum, good luck (you'll need it as many are in that mindset). If you have done well in medical school, there is nothing stopping you from scoring a 250+ on that exam. The resources are out there and you have the ability--the only thing stopping you from doing it...is you. Go get it.