Best case scenario, business school is a way to check a box for a degree that some company still requires if you aren't related to an executive, and get the slightest bit of networking establishment. If you are lucky, you might learn how to properly do some bookkeeping if you want to start your own business. Beyond that, the shit is so trivial and obvious that every dime wasted on it should set you back from your business career for making such an unprofitable decision.

And dudes who barely passed, failed, or dropped out of business school despite how unrigorous it is still end up millionaires often enough because business doesn't reward intelligence and hardwork, despite the bootstrap narratives all the wealthy "geniuses" play up. It rewards callousness, ambition, manipulation, and a ton of luck.