Any Educational Science Websites?

Ok..
So im a dropout. Pretty soon if I want to repair the damage ive done by dropping out I will have the oppurtunity of getting assitance by a college to get my real high school diploma (not a crappy online one or a ged). Anyways... Im lacking in the science department. I was curious if any of you know of any educational science and chemistry websites that could help me out? I need to learn about a whole bunch of stuff including chemicals and stuff. I forgot what its called but its like the food pyramid of chemicals (forgive me) lol. I feel dumb asking this but I cant get help unless I ask for it.

scienceworld.wolfram.com...