I didn't study for the SAT or take the PSAT. I just signed up and took the test on the appointed date in 1973. My application to UCSD was accepted. I did have many classmates who were all whipped up about studying for the PSAT, SAT and submitting applications to schools all over the country. I didn't have the time or resources to do that. I did manage to graduate with a degree in Molecular Biology at age 19 with the available resources. The education has served me well.
Yes, we trusted the test and what they told us about the test assessing our ability and not having to study. Seeing what came later, it looks like we were saps.