Hello. I'm a high school senior, currently taking a Pre-Calculus class. I am having little trouble understanding the material and I feel the class moves too slowly for my liking. I want to learn more outside of class on my own, but I don't want to be learning Algebra review. I have heard from other students and people that Pre-Calculus is mostly algebra review - it just contains more trig concepts, and a brief introduction to calculus. What do I need to understand in pre-calculus before I can move onto calculus?