Without knowing much about DYS, my thinking is simply that it has standards for potential and standards for achievements. The IQ tests give a better indication of potential, and the SAT/ACT indicates whether a person is really trying to develop the potential. From what I heard, for many smart and hardworking kids, scoring high in SAT/ACT is not that difficult. So I think it's reasonable to ask that the gifted kids achieve at least the same. As long as this is only one of the many criteria for admission, I think it makes perfect sense...