Wut
Steps 1 and 2 are the standardized tests you take in medical school, typically after years 2 and 3. They are like the MCAT in that they are standardized to a curve. Residency directors put a lot of value in them, similar to MCAT w med school in that they determine where you go for resdiency after med school.
Scores do vary bw schools, and some schools consistently produce higher steps in their students, which could be a testament to their curriculum, professors, or resources. Some schools are known for lower scores, which give the impression the school might not be as "good". Yes a lot is up to the student, but where you go to school can have a significant impact on your preparedness for steps I believe