A high IQ does not guarantee success. You can have a high IQ and still be naïve about how the world works. In reality, most people that drop out of school are going to struggle. Even with a genius IQ there aren't very many options to get a job. A lot of employers like to hire people with a college education. Without a college education a lot of doors will be closed to you. Without a high school diploma it is even worse. Regardless of whether you are smart or not, employers are going to want someone with a degree or experience. It is going to be an uphill battle to get experience, because in order to get that you have to hope someone takes a chance on you.
That's right, A high IQ means little to nothing is this world, it's become some kind of novelty.
IQ only "counts" or "scales" how intelligent your are, not how successful.
Intelligence alone won't solve all your problems and it might even have some drawbacks.
If you struggle in a poor corrupt country the thought of your life going away with nothing to show due to stupid fuckwits around you will lead in most cases to mental issues.
Imagine knowing you're smart, and getting tossed aside by morons. Giordano Bruno style.
And intelligence won't mean you will be able to work in a team, it doesn't give you leadership capabilities and most times people with high IQ are lone wolfes.
As for the career of dropouts with high iq it's quite normal that companies avoid them.
When you're a dropout it shows you are either having problems integrating yourself in the society or you lack morale or determination to finish something.
A company must run like a good machine nobody will risk putting there an element which might not be compatible with the rest.
The success stories of college dropouts can be counted easily but even they had some level of education.
Quitting while in high school...that's too extreme.