I would fix a bit: school 70% is useless ****, but that 30% is what you need. Also uni shows you only where to look for stuff, they assume you learn it all by yourself.
I am kind of such guy but with few buts. Thankfully to my self learning in programming i have quite good job now. I dropped at uni stage, because they did not teach me things i wanted to learn (and for eg i refused to learn how to make iron for magnetic core of electric transformer) . At that time computers evolved so fast and uni was still teaching 10 years old **** (like that thing about transformers when nobody used that technology (material) anymore) . I learned all programming by myself, but uni teachers feed me with vector math, physics, magnetic field theory, algebra, and many more things i thought that were totally useless at that point.
But they are not for game dev. Vector math, multiplying matrices, some elementary physics (for eg how Kepler rules work, gauss quadrature rule, Laplace transformation, Boolean algebra) all that is useful to know. Sometimes seemingly complicated problems were solved 200-300 years ago, you just need to know that and where to look. School teaches .
Example: vector math, its very simple to use if you know it. If you don’t you will be probably lost in all those blueprint nodes made for adding, multiplying vectors etc. Like getting normal vector to your surface, its trivial when you know that math, but if you don’t i am sure you get some very complicated rule with a lot of conditions.
Also what said, it is very risky. Then without good education you waste more time on same problems.