>>13
No. Shut up. "Maths" is the correct term in many countries.
>>12
Start at the bottom and work yourself up, obviously. Trigonometry, Precalculus, Calculus. The Calculus text I used in high school was by Larson, Hostetler, and Edwards, if I remember correctly; it was a very good book. I don't think it's that important to look for a particular text for Trig and Precalc, just find ones that cover sufficient content and do a good job of explaining the material.
Saying what you plan on doing in college would help me provide additional recommendations. I'm finishing up my undergrad in chemical engineering. I took differential equations in my senior year of high school (author: Zill), and apart from that I haven't really needed any more math, though I've taken courses in Linear Algebra (author: Strang), Numerical Methods (Gilat), Partial Differential Equations (Strauss), and Advanced Vector Calc (Marsden & Tromba).