Just to clarify. USCGA will only ask candidates who they find having a good chance of admission to complete the DoDMERB exam?
See http://cga.edu/admissions2.aspx?id=81&terms=dodmerb. "The names of applicants deemed competitive for an appointment to the Coast Guard Academy (or one of our preparatory school programs) will be provided to DoDMERB once they have completed the application process."