I did very well on both tests in high school without much cramming (I skimmed one study book from the library), and scored something like 90th percentile when I

I did very well on both tests in high school without much cramming (I skimmed one study book from the library), and scored something like 90th percentile when I took the ACT in middle school. Whether this is correlated to anything important in real life is an entirely separate question.