I'm going into highschool. Thanks to an acceleration program at my district, I've already taken Algebra I and Geometry. I am very much a math and physics nerd (take a look at my activity over on MSE and PSE if you wish) and spend a lot of time on my own reading and learning - for example, I've taught myself a decent amount of the basics of single-variable calculus (take a look at my notes on github - my github account is linked in my profile) and some linear algebra.
I'd like to take some math classes over the summer (online) in a way that my highschool would be likely to accept them - i.e., I want to take Algebra II this summer, but I don't really want to take it again this fall =) I'd also prefer the course to not be super expensive, as I will probably be paying for it myself.
Thanks, and I apologize if this is not the right site, but I saw similar-ish questions here.