Not sure if these are ‘hidden gems’, but I got into The Hun School and George School 
@softballgirl16 Congratulations! They are hidden gems as they are not much mentioned in CC.
I haven’t visited The Hun School (I only drove by when visiting other boarding schools, L’ville and Peddie, and visiting friends at the Institute on Einstein Drive) but I visited George School and liked it: the campus was beautiful and the students were friendly.
Berkshire, Lake Forest Academy, St. Mark’s (is it hidden… idk? I’m probably going there!)
And also Governor’s and Kent but I don’t know how “hidden” they are.
They’re far from “hidden” . If the school isn’t discussed here too often it qualifies as a “Gem” . I agree- for people who know these schools it doesn’t make sense. I did see a shift favoring “Hidden Gems” on the main acceptance thread this year… so there is progress.