Earlier quoted context omitted.
What if you have an IQ of say 90 and want to be really good at theoretical physics? I don't see caring a lot and working continously as enough to overcome IQ here.
IQ can be changed, if you work hard enough: http://www.businessinsider.com/actually-you-can-change-your-... This is true especially in your teenage years. It could change by more than 20 points. Can someone with high motivation and with an IQ of 110 make useful contributions to theoretical physics? I fail to see why not. IQ is determined by a test that's ultimately measuring skills. And skills can be learned. Even if…
Any other use is just Pop Sci.
So naturally you can change the measured IQ, but you're abusing the test.