IQ tests, SATs, ACTs and other standardized test like them are improperly named. They should be called "Tests That Predict Success or Failure in the School System From Which the Questions Have Been Derived."
You seem to have a pretty serious ax to grind with standardized testing.
the SAT and ACT simply provides a common yardstick for comparing grades at different high schools. Educators use them as way to judge an A at this school or this teacher versus an A at this school or this teacher. Nothing more. At best the SAT is said to predict freshman year grades in college (somewhat).