When my son was in Kindergarten, we had him screened by the school district to see if he qualified for the 1st grade gifted class. I believe the school used the KBIT. His scores on the screening test were so low that I decided to pay for a private psychological evaluation. He then tested as highly gifted (99.9%) on the SB-5 IQ test. Several of my son's gifted classmates also failed the screening test and later qualified for the gifted program after obtaining qualifying IQ test scores through private evaluations. I highly recommend that you have your son tested by a private psychologist. By the way, I never figured out why my son tested so low on the screening test. His teacher thought the questions on the test may have been too easy (my son is easily bored).