The bottom line is that if you are lucky enough to get an appointment to West Point, or any of the service academies for that matter, you don't need a scholarship. Everything is paid for, including tuition, room and board, and a lot more. When you graduate you are committed to serve 5 years active duty minimum. It is one of the most prestigious schools in the world. It is difficult to get a spot at West Point. Your academics and test scores need to be quite high, and you also need to distinguish yourself and many other respects, in terms of leadership and fitnes.
Your best bet is to go to the usma website and read up on admissions.