I was home schooled from childhood through highschool. I got a GED before I joined the military, then used the GI bill to go to university and took placement tests for everything, which put me at the same level as everyone else except for trigonometry, which I had to take a remedial class in.
I’ll tell you the strategy that worked for me last time (quit for ~2 years), and that I’m using this time.
Good luck.