To answer the question you originally posed, the answer is yes, probably. If you posted the essay online somewhere, then it might get flagged as plagiarized. If you never published it or posted it online somewhere, though, then it is extremely unlikely that your professor would ever know that you had recycled an old paper. Thus, you could "get away with it," in the sense of not getting caught cheating, which, by the way, is how the professor would see it if you did get caught.
However, as Kevin said, that would defeat the point of college. Also, I strongly suspect that the topic you have to write on now is a bit different from the one you wrote in high school. I would bet money that the professor has much higher expectations for it. So, recycling your old papers is not going to be a good way to get high academic marks, and it will prevent you from learning anything, which is the whole point of going to college. Which goes to prove, I think, that no one ever really gets away with anything. The consequences of poor choices may not always be immediately obvious, but there are always consequences, and they always catch up to you.
Sean, EssayForum.com