Hello, I intend to learn basic mathematics, biology, physics and chemistry next year in order to prepare myself to the university. When I say 'basic'' I mean high school level. I live in a third world country and I didn't learn anything at all in my shitty school, but I want to become a scientist anyway. I already have Basic Mathematics, by Serge Lang. It looks awesome. Could you recommend me books on the other three disciplines? I'd appreciate if the books weren't too big (because I have only one year to read them and I also have other things to study).