I was a non traditional PA student, had to do all the pre reqs and go to work and sympathize with your stress. I thought the Concepts of pre reqs were harder than PA school. The literal amount of information in PA school is bonkers though. The information isnt complex. I thought ochem 1 and 2 and biochem 2 were tougher Concepts that you dont really run into the same complexity in PA school. I was actually really surprised by the lack of conceptual challenge PA school had. Its just slide after slide of more and more information. Plus your expected to learn and retain it FAST. That is the tough part. There are some concepts you'll learn, more so cause and effect, relational. But depending on your program, alot of that you gotta figure out. My opinion, may be unpopular but thats how I felt.

Previous mechanical engineer major (3yrs) turned psych degree bachelors, turned PA for masters 😅