I need to get back to finishing school im only 17 and i don't go to school.?

-I am 17 years old, I am a junior in high school. But i was recently pulled out of school due to depression. I don't go to school and i was thinking about taking some classes online. Since i was pulled out of school at the beginning of the new tri i have yet to finish the last part of Chemisty, Geometry. But i also have my senior classes that i have to take. and also Civics and Economics. I need to start doing this now because school is very important to me. But i don't know How i will take these classes. I live in Michigan. My mother thinks that SC4 will let me take the rest of my high school classes but i don't think they do that. I need some help, because my mom isn't doing anything and i need to get this done.