I come from a bright family, but a had a bad home life and general a disinterest in school when I was young. I never paid attention and or did even the bare minimum required to pass. However, I do read a lot, and did even back then. Almost seven years ago I was able to hit the 90th%ile on the Math/Critical Reading sections of the ACT and 99th on the writing section so I'm assuming with a bit of effort I could land a job and build a life for myself

I'd like to start by learning everything I missed. How do I go about doing this? For reference, I checked around 7th-8th grade.