Good luck! You should check out Math Academy, it's more effective/efficient/cheaper but also a good supplement since it's accredited.
I recently turned 40 myself and I'm working through their Foundations courses (made to help adults catch up) before tackling the Machine Learning and other uni courses.
I recently turned 40 myself and I'm working through their Foundations courses (made to help adults catch up) before tackling the Machine Learning and other uni courses.