What are my chances?

Hey! As of now, I will be a rising junior this coming September and it is a pretty rough time for me. I did not do too well freshman year and I made a large improvement sophomore year. My GPA is now 88 and after taking the PSAT and practice SATS and ACTs, I have gotten an average of 1570s on SATS and 34s on my ACTs. My GPA is the only thing holding me down but I have a multitude of extra curriculars such as as being a large part of the Student Body Government, Debate, Fencing, cheerleading and a competitive dancer. I want to go to Cornell in Ithaca or Columbia since they are close to home. What are my chances and how should I improve Junior Year? Thanks!