Few actual classes. The only recurring subjects were: World Geography and Culture, Math, and Writing. As one-offs, I had one year of Electronics (because I requested it) and two years of Spanish.
Other than that, I spent the rest of my time mostly working on whatever projects I wanted to. It was amazing! I learned programming from a book and an old DOS machine, I learned basic electronics from a family friend, and I learned a ton of handyman skills such as carpentry from my Grandpa. And I built projects in all of these fields. The projects were open-ended and entirely informal (just for fun). I would typically work on one project for between 3 days and 3 months.
Other than that, I also spent quite a lot of time outside with my brothers (we had a nice backyard, and lived near a creek), and we spent a full day at the library every week, which I enjoyed immensely.
Also, I was not allowed to watch TV or play video games. But we had a ton of good books.