so i'm an incoming junior in high school, but i'm not 17 years old yet. i went through the whole USNA website, and i can see on how to apply. i know that i have to take all the standardized tests, take challenging courses, and join lots of ECs and sports. but, even though i'm not 17 years old yet, what can i do to "start" the application? I also already registered with USNA.