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I know a pretty cheap book you can order on Amazon. I think this may be what you're looking for.

An Incomplete Education: 3,684 Things You Should Have Learned but Probably Didn't https://www.amazon.com/dp/B000S1LE3I/ref=cm_sw_r_cp_apa_hkCCAb20QWKP3

Normally I restrain myself to giving terrible or depressing life advice, but this one touched me. So instead, I'm going to drop a heavy book on you.

Check out An Incomplete Education: 3,684 Things You Should Have Learned but Probably Didn't but don't try to read it all at once as it would be overwhelming. Read it in sections that interest you as you learn related topics.

For the meat and potatoes, check out Khan Academy. Pick a subject, set yourself up as a first grader equivalent and try to do all of its tests. Grade up until you hit a wall and work their content.

I regularly do curriculum on Khan as an adult to keep my mind from turning into concrete.