The G&T program where I live must have been doing something right.
First off, if I hadn’t put my kids into it, one of them would have got all the way through school thinking he was the smartest person in the universe, probably–because he was always the smartest in his class until the G&T program.
Second, when he got into high school he was strongly urged by the GT staff to go into the IB program, which he did. Not all the GT-identified kids did well in this–some of them didn’t like to do homework–but it made my kid work hard for his grades, and unlike some others, when he got into college (full ride, good school) his first couple of semesters were much easier on him than on some of his peers.
The other kid, also GT but one of those who didn’t like homework, dropped out of HS to work on computers. By the time he would have gotten through college he was out-earning his parents (and his college-educated brother, who took about four years to catch up).
They didn’t really have friends until the G&T program because nobody understood their kind of weird sense of humor. Actually, they did have friends, but it wasn’t until G&T that they developed a real sense of kinship with other kids their age. That was the draw. Until IB, the program was (or seemed to me) both easier and more fun than the regular curriculum. In other words: not especially challenging per se.
So anyway, one of them is now working for a very famous company where he’s practically the only one without a college degree, and the other is an electrical engineer for a Fortune 500 company and pursuing a PhD. Other kids from the program (i.e., their friends) have ended up at NASA, at the CIA, on Broadway (it’s not all math skills!), as dentists/orthodontist (well, one dentist, one ortho), as a wedding DJ, as a paramedic, and as a golf pro.