^^^^^
High school students with college credit are typically treated differently than full-time college students. USNA has said that they won't review a college student's packet until first semester grades are in -- that's usually Jan or Feb. This can be good or bad for college students as your college grades count much more heavily than SAT/ACT scores. USNA believes that your performance in college courses (assuming you're taking plebe courses) is the best predictor of your academic success at USNA, which is why they wait for your first semester grades.
If you complete h.s. early and thus starting college in the spring or are taking college credits while in h.s., you are still considered a h.s. student and USNA will review your packet based on your h.s. data. Obviously, getting As in college level courses while still in h.s. is a help but, in USNA's view, it isn't identical to being a full-time college student.