The Most Challenging Undergraduate Math Course: Is Advanced Calculus the Toughest?

What is the Hardest Undergraduate Mathematics Class?

In my opinion Advanced Calculus(AKA Undergraduate Mathematical Analysis) is absolutely the HARDEST undergraduate math class a math major must take. Obviously the difficulty of a course is largely dictated by the professor, but in general, I think at most schools, Advanced Calculus is the hardest class for math majors.

If you make it through this class, you can make it through a math degree imo. My class started with like 25-30 people and within a few weeks there were only 10 of us, completely insane!

What do you all think? Is Advanced Calculus the hardest? Please leave your comments and questions in the comment section below:)