Kelley after freshman year

I am high school senior who is not a direct admit into kelley, my goal is to bring up my GPA this last quarter but that is unlikely to be enough to hit the 3.7 mark. If I go to IU, can I take some classes at a community college this summer to make my first semester work load lighter when making the transition to college or would that look bad when applying to kelley? Also, I have always wanted to join a fraternity. Is it a bad idea to go through first semester rush knowing that it can be a time consuming process?