Vanderbilt is a type of school that appreciates everything on a holistic level. Start studying for the SAT every single day. In your essays you also need to make your ECs seem meaningful rather than just a list of clubs you participated in. You definitely will get into one of those difficult schools. Here are your chances assuming that you have above a 2200 on the sat.
Vandy: Low reach
Penn: high reach
Middle bury: match
Dartmouth: low reach
Good luck!