You cant "transfer" to an academy or prep school in a traditional sense. If you go to college for two years and get accepted to an academy... you start as a freshman.
If you go for two years and are accepted to the prep school then you go to the prep school for a year.. then start at the academy as a freshman.
The good thing is even though your considered a freshman you can validate classes that you have already taken by passing a test designed to show your knowledge in that specific class.
So your time in college wont be wasted.