Research shows that the best predictor of how students will do academically in college is how they did in high school, NOT scores on the ACT or SAT. Both of those college admissions tests are businesses designed to make money, not to accomplish any valid educational goal. Hell, the SAT never even included a writing component until the president of the California state system of universities said it would drop the SAT unless a writing component was added. Guess what? The SAT immediately added an essay. It couldn't afford to lose all that money from the California system. And, of course, writing is the fundamental skill in every academic area.
I did pretty well on my ACT, but I hate it and the SAT. Both are scams.