That’s exactly how I’d describe it. It was a ton of information, a big shock compared to undergrad, but very doable. In undergrad I had to study for around 2 days for an exam to feel prepared. Now I had to study for 3 days to feel prepared to get around average, and 4 days to get above average. So for me at least, it wasn’t world changing but it’s definitely more work than undergrad. When they strung together 5 exams in a week and a half for finals, and each exam had 12-24 lectures of material on it, that meant studying for almost a month straight. Some people need to change their study habits entirely in order to make it through. Others do what they’ve always done.
If you’re the kind of person who needs to put in a week of hard studying for an exam, you’ll probably be the same at Penn. If you only need to study for a couple days, you may find you can get by with that. More likely than not though, you’d need to do what I did and add an extra day or two to feel comfortable. It’s a lot of material that they expect you to know and it’s not like anything you’ve done before.
I wouldn’t listen to the people who say “oh man, when you get to vet school you’ll be in the library every night studying until 10 pm after class and you won’t have enough time to even breathe.” Maybe that happens for some people, but for me and a lot of others that was only the case during finals. During the rest of the semester, we still had time to do hobbies, hang out, make a good dinner, explore the city, etc. Maybe things will change as school progresses but time will tell.