@dadof4kids since it seems like you’re looking for specific info relating to math courses at Ivies, I found an old comment (2011) regarding calc III (Math 2130) at CU:
"While I am sure 2130 is easier than 2200, it is still pretty difficult. I noticed that we did the exact same topics as 1920, except for the end where we skipped stoke’s theorem and did differential equations.
Homework counts for 30% of the grade in the class (equal to the final) and it is graded for correctness so you have to spend a lot of time on homework. I would spend about 10 hours a week on homework and go to office hours at least once a week as well. The tests were fair but time was an issue (they were given in class, except the final)."
Anecdotally, my S took Calc 2130 his first year at CU. He earned an A in AP calc BC and scored a 5 his senior year in HS. He said that 2130 was tough and it didn’t help that there were so many super smart kids in the class so the competition added to the rigor (and to his stress level). He also agrees with the commentator above regarding the number of hours spent on homework for this class and visits to the prof.