Upperclassman Admission Chances?

Hello! I am a freshman that has unfortunately missed the sophomore application due date. However, I intend to apply for junior in to Andover, Exeter, Choate, Loomis Chaffee, and Deerfield. This will be my first time applying to boarding school. What are the chances they accept an incoming junior?

It really depends on your stats, but there are limited spots for juniors. Limited meaning 25 or less new juniors at a large school, such as Exeter.