http://www.math.hmc.edu/calculus/tutorials/
You will learn calculus through this. It is not the best tutorial, but feel free to ask questions.
I think a site called particleadventure.com is very good and informative about the sub-atomic world. I was lost before I saw that site, now I'm good.
You should also consider books, from the library or store. Some libraries have Physics/Math textbooks. Photocopy the pages and study them at home. :)
Have FUN!
Note: Don't be afraid to pick up books in the Junior section. I found two books that didn't belong there. (Introduction to Relativity, and The Basic Elements of Chemistry) I don't know why it is there, but I highly doubt a junior would pick that up.