I took the ACT in the mid 80’s. It was harder than the SAT which I also took. I took it twice and did slightly worse.
Looking back, I would say the ACT validated my inward suspicions that if the truth was known I was never college material to begin with although I did somehow manage to graduate and get the degree even while battling what was then a debilitating medical situation.
That said, there is more to a successful college career than smarts.