6 years ago I finished school, but not at school. I'd rather say, entirely out of the school, I studied at home.
Many will find it strange, but I liked it, homeschooling, when no one forces you to do tasks that you do not want to do. When mum is always beside, and the atmosphere at home disposes to positive thoughts. Willingness to learn new things only increases! Now I'm 23 years old, studying at university and working as a writer. I'm helping kids with their homework, essays, and other tasks.
So, to start, I recommend you to check https://www.parents.com/kids/education/home-schooling/the-best-homeschooling-resources-online/ , there you can find best homeschooling resources online. But don't forget about lots of excellent books, like this https://www.amazon.com/Everything-Homeschooling-Book-curriculum-environment/dp/1605501352. If you want, you can check out my blog, it's also about studying but for adult children.