I was surprised that the matriculation of Oxbridge Academy, where Barron attended high school, is not all that strong.
Good Midwestern private schools like Detroit Country Day, Naples Florida Community School, Cincinnati Country Day, Louisville Collegiate School all have equally good matriculations.
Niche rating is #535 in the US.
Nothing wrong with that but there are many good schools in the Palm Beach area.
I’m sure there were many factors in choosing that school such as security, location to home, student body mix (R vs D), admin known to parents, etc.