Which specific universities are you referring to here?
You're certainly not describing any university exam I ever recall. Mine were incredibly demanding of the ability to understand technical questions and solve them by applying cold, hard science in an objectively correct way.
I went to the University of Leeds. I earned a first class degree (83% grade overall), MEng, in Electronic Engineering, with honours.
I did not find it particularly challenging. Some exams were hard, but it was mostly a memory exercise. A few exams, I got only 45%, just above the pass mark, I just wanted them to be over with. The hardest bits were coursework, but I did electronics as a hobby (and still do). I had my own lab (oscilloscopes, soldering irons etc) so doing coursework at home, and not in the limited lab hours, meant I could achieve a lot more, and my practical work was generally better, especially software wise.
Most lectures were a waste of time. The lecturers could have been easily summarised into 1/3rd or 1/2 the time actually taken, or would be better as a slideshow or article. As a result, I cannot say I attended every lecture, as I had better things to do with my time. Mostly finishing coursework. I didn't have much of a social life during university because I was focused on results. I also did some contract work to gain experience from the industry while at university and took a gap year to do an internship.
Overall, though, I think it was worth it. I learned a lot at university, and I was able to get a good job offer pretty quickly after graduating. I've definitely learned more in my last 18 months at my current employer than 4 years of university, though.