What should I do in high school to get into competitive accounting programs?

I am considering applying for competitive accounting programs. One of these programs is Holy Cross' , which only accepts 32 students per year. What would make me a good applicant for admissions into this program. I have taken all of the hardest math classes at my school and consistently get As. My SAT/ACT scores for math are near perfect, and my Math 1 and Math 2 subject tests are both above 700. However, I also want to do pre med. In the last few years I have put a lot of emphasis on things such as volunteering at the hospital, shadowing, and taking classes that relate to pre medicine. Therefore, I haven't done much that relates to accounting (if there is even anything to do as a high school student). Many of the classes I have taken in high school were math/science related. I will only take 2 businesses classes (economics and intro to business) because I just realized I am interested in accounting. What do you think I should do?