Next year, I'm going to be a freshman to Podunk University, Nowhere. I'm not very happy with my situation, but I know that it's one of my own making. What sort

Next year, I'm going to be a freshman to Podunk University, Nowhere. I'm not very happy with my situation, but I know that it's one of my own making. What sort of things - besides an academic excellence I didn't display in high school - should I do to break through into an upper-level school? Thanks very much.