Referring @youmatter:) to the articles
A great, targeted school list can lead to success with your medical school, dental school, or other health professional school application.
www.studentdoctor.net
All medical schools have a stated mission. Understanding how you fit into that mission helps you focus your application for success.
www.studentdoctor.net
(I'm confused... are you the OP with a different avatar login? You didn't address my questions.)
What is the nature of your community service (200 hours)? What are you doing? Who benefits and how? What impact is made on the community?
Hours only give me a sense of which applicant pool best fits you, but what your impact was tells me how well you could fit with the brand-name schools. Why should that school take you over someone with more hours? I do not see compelling reasons for Duke, Stanford, or Mayo.