How manageable is the courseload at Penn? (incoming freshman)

So college is life is getting nearer and nearer and was wondering how rigorous the courses are. I am a prospective political science major and I want to go to Penn Law School. Is it difficult to get into law school given the difficulty of the courses? How would you rate the workload? How difficult are the midterms and finals?
As with any big new things, I tend to get really anxious and some advice would help out a lot!