The hardest math I've done wasn't even in a math class. It was physical chemistry. I found calculus so simple but applying it to that class was impossible.
German
I really don't like it and it is obligatory
I hate calculus, it officially convinced me that I don't want to get into a career that relies heavily on advanced math.
Maths was fine if I worked hard on it but I never got the hang of angles for some reason.