Chances to Get into Phillips Exeter / Andover for 11th Grade

I understand everything said. Let’s say I take a year to do volunteer work, involve myself in school leadership, improve my grades this year and next year when I’m in 10th grade, and then apply to Phillips as a repeat 10th grade, and keep on practicing the SSAT. Will I then have a slight chance of getting in or will I just be wasting my time? I really appreciate the honesty.