For me, the reason I was never allowed to set foot in a university was German, PE, and Norwegian literature. I was suffering from severe health issues and I didn't have the energy to do all the subjects I had no interest in. So I poured my focus into the subjects I enjoyed and/or were relevant to my future plans(biology, calc, English, physics, history). I generally nailed those subjects. But because I failed German, and almost never showed up for PE, I was denied the opportunity to follow my dream and study biology.
Part of the problem is also the very inflexible admission requirements for Norwegian universities.
Hard sciences degrees were really hard to get into in Norway too. Some times the best way to win is by not playing their game.
I am however lucky in that I taught myself programming since I was 14, so by the time they kicked me out of HS, I was capable of doing it professionally. But it took me years of networking to get to the point of even getting interviews for such jobs without having a HS degree. I did eventually get to where I can find somewhat intellectually rewarding work for a few months a year, when I'm healthy enough to do so. Whenever I try to do more I always crash and burn, so now I just try to work little as possible to stay sane.