CGAS (prep) is just one of the offers so to speak, no one has an a full appointment and an offer to prep school. Prep school is used to strengthen the candidate in some way, some kids need an extra year to get them where they need to be math and science wise before heading to the academy, some are excellent candidates but need a higher PFE score. Prep is specifically for improvement, also though its the academy investing in you so if you do what you need to your chances to matriculate the next class is high. Waitlisted kids are kids the academy deems candidates for full admission, as a selective institution there are always more applicants than spots so thats where the waitlist comes in. As I understand it if you are waitlisted and don't get pulled from the waitlist you are able to reapply the next year EA which non-waitlisted re applicants can not do (double check this with your AO). Also, if you read the forums you will hear of people self prepping which means people go to the same institutions that the academy sends CGAS to, but on their own dime (or scholarships). This gives them access to the same curriculum the prep kids get, and an opportunity to improve their application to reapply. This was our daughters Plan B, and she would've been able to self-prep on full scholarship. Like I've mentioned before our DD was called from the waitlist late May last year. In meeting her shipmates I actually know more quite a few that were re-applicants either because of being waitlisted and not coming off the waitlist, or being denied for a waiver and encouraged to apply the next year in hopes a waiver spot would open. There are so many variables, bottom line if it's a no for now but your kid is still really feeling called to be at USCGA they should try again!