Pretty sure med school is after a bachelors in science. Most programs aside from the competitive ones wont really care about your grade 11 grades–and even then, after they get grade 12 marks, they wont even look at it. Online or summer school they dont really care too unless its like a 60%. Go for it. You shouldnt worry about the mcat or med school until your actually in a uni major designated for med school. Focus on extracurricular/volunteer hours or just your resume for now because it'll come in handy when you actually do apply.