I'm familiar with Khan Academy. It has served many people and that is amazing. Unfortunately is not quite as in-depth as one would wish.

Most physics programmes complain about the lack of depth that freshman students arrive with at universities. Does everyone need to be a physics? no, but it shows how mismanaged are the expectations in high school.

It would be great if the incentives were aligned for a bigger portion of the population to advance without getting lost. That's the first step, a compass.

Thanks for passing by :)