Chance a junior, please

<p>I'd like to know my chances. I'm a junior from a very rigorous, well-known private school in New York. My school does not report GPA or class rank. My grades for the 1st semester of this year, my junior year:
English: A-
History: A-
Pre-Calculus AB: B+
French IV: B+
AP Biology: A</p>

<p>Until about 4th quarter of sophomore year last year, my grades were slightly worse than this but I have only gone up since then in junior year.
Test scores:
ACT: 31 composite</p>

<p>PSAT (I know it doesn't actually count for anything, but just use it as a benchmark for what my SAT will likely be): 77 critical reading, 61 math, 77 writing for a total of 215.
I play on varsity football and baseball but will probably not be a captain of either. I am also vice president of Young Republicans.
What are my chances for: University of Virginia, Dartmouth, UPenn, and Michigan?
Thanks, and don't tear me apart too badly (but be honest!)</p>