Find USA Textbooks: Math, Biology, Physics, Chem for 9-12

[thieny1991]

I am looking for USA textbooks regarding to math, biology, physics, chem for 9-12 class.
please help me?

 

[sjb-2812]

Is that age, or year in school? What is in use where you live?

 

[thieny1991]

Is that age, or year in school? What is in use where you live?

Dear my friend,
I am living in Viet Nam. I will attend Uniersity of north texas in this August, study 1 year for Enlish first. I graduated University of Ecomomic Hochiminh city. But now I would like to continue learning Biomedical engineering. I am starting from the crash, reviewing Sience, math, biology, physics, chemistry so I had been looking for these Textbooks From 9 -12 grade. But I can't afford to buy these books, and actually I don't know what kind of books I should study. The US students don't use a same textbook, they don't have a general textbook.
Beside that, i didnt study science a lot, didnt have much chance to experiment in the Lab.
So i really need these textbooks.
Please help me