MBA from Harvard Business school, considered the toughest in the world.
As an aside, I laugh when I hear people say that Bush got his Harvard MBA handed to him. I know many Harvard MBAs and they will tell you that no one gets that handed to them. It doesnt matter who their Daddy is—because there are sons and daughters of Kings, Princes, President’s and Senators at Harvard every day. Bush would have been the kids of a back bencher when he was there. Not without influence, but certainly not enough to “buy him” a degree.
And on top of that, he flew jets. I know the Air Force doesnt let idiots do that. The jets are too expensive to allow idiots to crash them all over the place.