My  3 children  all took the ACT several times and after tutoring  sessions and amazingly they scored the exact same score consecutively.  It’s an amazing test of intelligence,(reply>), I taught my children how to perform better on the SAT.  The test scores improved by 200-300 points.  I have 2 children who boosted scores to 800 in one of the SAT sections.  Intelligence is 50% non-genetic and this can be used to boost IQ enormously.