These are all really great questions. So first, I would say I think it’s great that you’re asking these questions NOW as a junior in high school rather than asking them as a senior after you’ve already applied or after you’ve interviewed when you might feel much more obligated to attend if given an acceptance. In terms of getting in, your highest chances, just in terms of the number of seats available, is by being an in-state applicant.
You’ve probably perused in great detail the UMKC School of Medicine website, but some things that I want to bring to your attention that you might want to look at:
https://med.umkc.edu/saturday-academy/
https://med.umkc.edu/admissions-events/
https://med.umkc.edu/bamd/visits/
So some things to keep in mind:
In terms of the program, unlike other Bachelor/MD programs across the country, UMKC BA/MD students here do not take all of the traditional premed prerequisites (Gen Bio I & II + Labs, Gen Chem I & II + Labs, Organic Chemistry I & II + Labs, General Physics [non-calculus based] I & II + Labs). Now some BA/MD students will tell you that it’s not necessary to have that, which is true, but in terms of a fall back, if you were to decide to go the normal route, depending on when you leave the program, it’s very much possible that you would have to redo some undergraduate years.
The program runs year around with no huge breaks in time that some other Bachelor/MD programs have. Is that something you can handle? Only you really know that answer.
I think in terms of preparing yourself for the coursework in the BA/MD program, there is only so much you can do as a high schooler. AP courses are great, but even those only take you so far although they are excellent in terms of preparation for course content in college level science courses. If you have a high school Anatomy course, that may be helpful although it’s not in any way a prerequisite for Year 1 Anatomy in the UMKC BA/MD program.
That being said, there are some AP tests that are helpful when it comes to knocking out courses for the undergraduate degree:
https://catalog.umkc.edu/colleges-schools/medicine/typical-six-year-program-of-study/
AP Chemistry, AP English Language, AP US Government, AP US History, AP Psychology are all helpful towards being awarded credit towards the undergraduate degree in the Bachelor/MD program. You can see the required scores here:
The AP Biology exam does NOT give you credit for General Biology I and II at UMKC, so don’t waste your time with that exam.
Are you going to “have a life” in the way that a normal undergraduate in a 4 year degree program would? Honestly, I would say that will not be the case. And anyone who is being honest with you will be upfront about this fact. This program requires BA/MD program students to “grow up” faster (maybe even sometimes too fast) than what they normally would in the traditional route.
In terms of “What should I include in my application and/or resume to make myself a better candidate?”
I think outside of doing the best that you can academically, taking the most rigorous high school curriculum (often this involves Honors/AP courses) that you can handle, getting involved in health care experiences that show you how the medical field is really like, is important. This can include “clubs and organizations; volunteer or work experience in a hospital, doctor’s office, nursing home, or other health-related facility; shadowing experience (includes shadowing of any health-care professional); participation in structured or formal health-related programs; medical or health-related research; and other health-related experiences that may contribute to your interest in medicine.” These should be things that you’re genuinely interested in and which you can learn from. I would have activities that you’ve had a sustained involvement in, rather than just doing things temporarily for like a month or two and then being done with it in order to check a box.
In terms of if you decide to leave, you would have to apply to medical school through the normal route. That’s somewhat easier to do in earlier years of the program to catch up than later. We really don’t have much school released data in terms of those who leave the UMKC BA/MD program and then apply to med school traditionally either at UMKC or at another undergraduate institution. It would be entirely anecdotal and something you’d have to seek out in terms of information from current BA/MD program students (who either may not know, or may not readily divulge that information of friends of theirs who may have left the program).
Hope this helps. If you have any other questions or if I forgot to address something, please let me know and I’d be happy to answer it.