All I know about Chedvas is that its shana bet for American girls, however they might also have quite a number of Israeli girls going there for shana alef. I’m in twelth grade now and I have a friend my age who is planning on going to Chedvas next year (they are one of the only sems who allow girls living in Israel for some reason). My friend told me they don’t have tests or homework (I could check that with her again if you want)and they are mostly a BY crowd- more so that Pninim.
Thats all I know- hope it helps… 🙂