I'm going to be a 3rd year physics major this coming fall. I've found the Feynman Lectures on Physics to be nothing short of amazing. They present anything you could ever want to know or learn in a physics classroom in a very easy-to-understand format. They're expensive, if I remember right, so it's not something you should buy if physics is a passing fancy.
Other than that, go to the library and find and read whatever books interest you. Read up on calculus too, specifical differential equations and vector calculus. Knowing at least the basics of these will help massively when your teacher starts throwing up equations and proofs with little explanation.