This question has seemed to go from "What EC's/awards should I put on my resume from HS?" to "What EC's/awards should I put on AMCAS from HS?" and I agree with the advice that has been given so far for AMCAS, but a resume is a bit different and needs to be specifically tailored to the job you're applying towards.
Say you were heavily involved in volunteering with American Red Cross in HS and are now in college and applying for a part-time job with them. I would definitely include that experience and a few bullet points about what you did/learned even though it was from HS. They would probably rather hear that you have worked with them in the past over replacing that spot with tutoring for o-chem or something completely irrelevant.
So my answer is if it is relevant to the job and you are still able to talk about the experience, include it on the resume.
And keep the resume to 1 page so only include what is most relevant.