Which preparatory school would best prepare me and improve my chances of an appointment? Also, if anyone knows, which one typically has the highest success rate.
This is a huge ask of someone else, with a lot of legwork required. Yes, you will likely get some valuable anecdotal insights from individuals, but that may or may not be best for your case. No one can tell you what is best - for you.
Time to do your own legwork at primary sources!
The ability to organize a project, research and conduct a comparative analysis of key elements, and draw conclusions, is an example of the executive, analytical and critical thinking skills expected of a future junior officer.
Review the websites in deep detail for particulars on their program organization, performance, outcomes and other aspects of their SA prep program. Organize the info in a table or spreadsheet. Don’t forget cost!
Think about program elements of interest: Are college credits offered? One or two semester program? Tutoring available? Any college ROTC classes offered? Emphasis on one service over any other? Available sports? Items like this. Add to spreadsheet as you see fit.
Develop your questions you wish to ask about their programs and add them to your comparison table. Then, organize an “interview sheet” for each school and identify the point of contact, perhaps whoever directs the SA prep program. Email that person, briefly tell them about your situation (Are you a SA scholarship recipient? Self-prepper?) and ask for a phone appointment to discuss some questions you have.
Execute the phone appointment with your best professional and appreciative live phone skills, also a future junior officer communications skill.
Gather and organize your information. Put your thinking brain to work as you identify what seems most valuable to you, how their “stats” look, etc. You will eventually get a feel for how you would rank them.
Brief your parents at intervals. They should be appreciative and impressed with your adult approach to this research project.
If these schools were not successful at what they do, the SAs would not designate them as partner schools. Therefore, it is a matter of determining the best fit for you.
If you do this exercise and take ownership of the thinking, you will feel you have done your due diligence.