I wouldn't over think the academy thing, or college in general. If you are a high school freshman you really have a couple years to contemplate. Do things that work for you, be that classes, extra curriculars , sports, or whatever else.
Honestly , I think many of the kids on this board, and parents too, do way too much planing and effort focused on getting an academy spot. At some point you need to build your college and academy résumé, but it shouldn't consume your world ever, and certainly you can lighten up a lot during your freshman year.
I think if you just take things in stride and see how things go your first couple years in HS, then reassess your goals. Maybe they will include USMA, maybe they won't. If you are still interested, then build the application resume. If you are forcing yourself to do things in order to make yourself a good candidate, you probably won't like it when you get there. Obviously you need to be a hard working and conscientious student, but I wouldn't worry as much about what classes you are taking this year. Others may disagree, but as a father that would be my advice.
As an example, and perspective, my son never contemplated an academy until the end of his junior year, so nothing was done with an academy application in mind. He just did what he liked. As it happened though, he had an interest in most of the things the academies look at, and was a good student. He loved team sports, and was pretty good at them. He wanted money in his pockets, so he kept a job. He was already on NHS, and was involved with some activities, but I will admit that the one thing I thing he did do, right when he decided to apply to West Point, was run for NHS President, and he won. The other thing he did was motivate himself to study and take the ACT several times, which paid huge dividends. But that was in the summer after junior year, and during senior year. Point being, you don't need to stress at all this early. See how you feel in a couple years.