Affiliate Marketing Secrets

I am about to be a high school Senior in a few weeks, and decided on pursuing a career as a doctor. I’ve been researching on possible Medical Schools and college, but I was wondering a tiny detail.
Colleges such as Columbia, NYU, Stonybrook, and now Hofstra have a Medical School, and are also possible choices for me after high school as well. Say I attended Hofstra, or any other school, and then applied to that schools Medical School as well. Would I have any sort of advantage because I went through my undergraduate years there?
Also as a side question, Hofstra is affiliated with North Shore LIJ, and I began volunteering in their ER as a shadow and observer to the ER staff, and plan to continue my volunteer for the foreseeable future, so would the fact that I am somewhat affiliated with Hofstra’s affiliations, would I stand out favorably?
I’m not relying on these ways to get into college and Medical School, but I was wondering if they would serve to my advantage more than somebody with similar grades or slightly better grades than me.
I don’t really know too much about Hofstra’s Medical School Program as its still new, but i have an overall average of a 96 so far, took a very rigorous course load throughout high school, and am thinking about majoring in Physics as I have heard it might help me stand out and I enjoy Physics a lot anyway. My high school is a Catholic school if that makes a difference.
What are my chances in general, or my outlook?