They use a combination of initial screening (KBIT), achievement scores, teacher/parent evals, and finally the WISC-IV in their matrix. There are 3 stages, and each stage has a minimum score to get through to the next.... minimum scores to get through are not very high.

Kids do not have to score 130 or above on IQ test to get in.

But everyone wants their kid in the program, when it is actually not really do any good for anyone involved (too many kids, not enough resources). So frustrating.