LOL!
I went back for my MBA a few years back. Could not believe the lack of rigor when compared with my undergraduate studies 3 decades ago.
I had a similar experience. I did not finish my undergrad degree. I went back in my mid-30s and found if you just did what you were supposed to do, go to class, take notes, do the reading and homework, study for the exams, it was almost impossible not to get an A. I'm now working on my second Masters degree.