Summer Courses

<p>Is it possible to take summer courses as a high school student that can be used as credits when going to USC?. My high school GPA is not very good because I messed around a lot, and didn't take school very seriously. USC is the school I want to go to for college but my GPA is not good enough to get into after high school. I want to transfer I get 30 credits (thats a year of college right?)</p>

<p>What classes should I take that would make this go toward it? I want to take summer courses this summer that will go toward those 30 credits.</p>