Chances of Boarding School for a Current Junior

Hello everyone! I am currently a junior in high school and have recently decided that I am going to apply for several boarding school programs as either a repeat junior or an uprising senior for the upcoming 2017-2018 school year. Though I haven’t taken the SSAT yet, I was just wondering, will schools like Hotchkiss, Blair, and The Hun School of Princeton accept students that are applying as juniors and will be coming in as seniors? If so, will a generous financial aid package be offered if the student is in desperate need of it? Or will most of the school’s financial aid be going towards freshman and sophomores?

Getting in as a junior is tough everywhere. What is your reason for wanting to go to BS? Why those 3?