The beautiful thing about learning math is it is incredibly well curated up to about 3rd year university. Suggest re-taking the high school courses over again v

The beautiful thing about learning math is it is incredibly well curated up to about 3rd year university. Suggest re-taking the high school courses over again via correspondence. Since you are interested and motivated it will not take you long at all. Then move on to first year calculus and linear algebra - either by correspondence or audit the actual class. I don't think there are any shortcuts up to this point. After this it is reasonable to self-curate the material based on your particular interests.