As long as your classes fulfill USAFA min requirement for high school curriculum you should be fine.
... <deleted text>...
If you are a Senior then your chance can be improved by taking at least 3 subject tests
... <deleted text>...
This is in addition to your ACT or SAT.
... <deleted text>...
If you can provide a permanent address in the US you can use that as your Congressional District.
... <deleted text>...
Your app can be treated more like a home school student.
... <deleted text>...
Academies suggest what I suggested here for students like you.
... <deleted text>...
2-3 Athletics - Team Sports better.
... <deleted text>...
If you do all this you have an excellent chance for an Appointment.
Apologies for the length of this post. While the quoted prior post contains many good suggestions, if you can do them, you need not necessarily take them as absolutes particularly if your educational environment did not offer those opportunities. I also want to take exception with some portions of the post.
Forewarning, my experience is very limited that is to a sample size of one for DS who is a current USAFA cadet.
My DS's education did not include all courses a U.S. high school student would take. DS had no U.S. history, less English, different Math and Science. They want to see strong academic performance in hardest subjects available to you. For example some European countries have national exams in the sophomore and senior years where course grades provide a view into your ranking within the national population. The Academy seems to be aware of other developed countries educational systems and does not treat as home schooled. Our experience was that it was an advantage and they adjusted GPA upward.
DS only took SAT no subject tests. His Math English was strong but not near 1600. At USAFA they placed him out of History, Science, Languages, and Math courses.
As a U.S. citizen who is currently living outside the U.S., YOU DO NOT NEED A PERMANENT U.S. ADDRESS. This is the mistake one nominating source made. In our DS' case, it took Academy Admissions and their involving some USAF liaison to Congress to correct that misunderstanding. It is the voting district where your parents or you can vote which determines your State related nomination sources.
Some countries do not have as much sports related activities as a typical U.S. high school. Our DS was most worried about this. In his case one of the educational systems he was in literally had none other than one intramural team on weekends. Here too Admissions did not seem to hold this against him. I believe they took into account that his academic classes were from 8:25am to 6:10pm each day. Thus not leaving the late afternoon period the typical U.S. high school would have for sports. However, before his high school schedule precluded it he did participate in a club sport. Also throughout high school he had another sport as a personal hobby for which he qualified for USAFA's team once there. On the CFA I believe he exceeded the USAFA reported averages in all but one event.
He did not have scouts, JROTC, or the like but did have some academic club leadership.
USAFA is looking for a diverse set of strong candidates. You need to build a strong application from what is available to you in your environment. While my DS is not part of any racial minority, I suspect he was a diversity candidate in the sense of having a different background than most applicants which seems to have played out to his advantage. Of course he probably was also lucky. There is no guaranteed single path. You just need to put forward the strongest package you can with the opportunities which have been available to you.
Good luck.
