What Should I Major In?

I want to get into Dartmouth, Vanderbilt, Cornell, UC Irvine, Fordham Uni., Boston College, Boston Uni. or NYU. I got straight A’s freshmen year except for social studies and creative drama (B & C). This year, the first half I got 3 B’s & a C, they were honors and I slacked and I didn’t study whatsoever. Now I have honors biology, algebra II honors, english 10 honors, and drivers ed. I want to succeed, do I still have a chance at these schools. And how do I stay motivated? I do swimming and it’s so time consuming by the time I get home i’m exhausted, they give us like an hour to do homework but I get distracted, and I get home at like 6:30 and then I have to eat, shower, etc. I need to get straight A’s and go to a good university, help me?