That is a super competitive program. I would say the best thing is to avoid becoming overly attached to it, because admission is so unlikely. Just try your hardest to get perfect/near perfect academic stats and find co-curricular and extracurricular pursuits that are constructive and you are passionate about - and execute.
Medical research is tough to get as a high school student. Check out college research or summer programs that are science-y and have their program costs covered - those are usually the well-regarded programs.