So, I am bored with Algebra 2 in high school and I've been teaching myself calculus and I've learned it pretty fast, well of course not all of it, but I am learning it quickly and grasping a lot of the concepts. So, is this an okay way to learn elementary Calculus? It really helps that the book I have is very well written. It's called "Technical Calculus with Analytical Geometry" -a Dover book by Judith L. Gersting. I also sometimes go to the math/physics/astronomy library at my local university(my parents work at that school) and learn a lot from their books. I will ask willing people about it as well, but I am not in a class, but when I do enter one I will be prepared because I've gone through a semester or so in a month or less and I've tested myself and it's pretty much second nature! What is the downfall to teaching myself like this?