[gcmeplz]

State-based ACT scores are also highly influenced by who takes the ACT. If more students choose to take the ACT, the scores might go down even it's because your education system is doing a better job because more kids are trying for college.

For the same reason, you'll see some surprising state scores for SAT/ACT. If you're in a state that prioritizes the ACT, the main students taking the SAT are the strongest students who are looking at out-of-state schools.

Aside from the time lag, I don't think you can look at voluntary test scores and draw many useful conclusions from it.