/sci/ Is there a recommended comprehensive coursework available online that will basically take me through all of highschool math?

I never really paid much attention in highschool during math classes, and I feel like there is some fundamental gap in my very basic highschool level math knowledge.

The guide in the sticky seems to focus mainly on undergrad level math major type material.
I have looked at khan academy, but it seems like each course level is pretty brief given that they say you've attained mastery of a subject after completing a 4 question quiz