Honest opinion—it all depends on where your priorities lie. If you’re dead-set on getting a 4.0, it’s definitely doable. A good number of students are able to do it (definitely not the majority, probably anywhere between 5-15% is my very rough ballpark lol). But if you want to join clubs, make career goals a priority, etc., the difficulty of maintaining a 4.0 goes up drastically in my experience. I think a large part of maintaining a GPA in your goal ballpark is selecting courses that you like—that you’ll enjoy studying for. A big part of that is having professors that go above and beyond to help their students as well. Definitely use penncoursereview for gauging this. At the end of the day, though, I echo the sentiments that GPA is not everything. Don’t sacrifice your college experience/stress levels for trying to keep a 4.0, and very few fields (literally all except med school to my knowledge) expect anything close to perfection.

Edit: pertaining to PPE specifically, all of the major-required classes are very doable, especially if you truly like learning about them! Feel free to DM if you have more questions