What was the most difficult class you took?

Algebra II/Trig, the hardest slog of a class I have ever taken; we were expected to memorize page upon page of trig. Identities that really had no practical application, and without any real ability to derive them from each other. Even worse, we weren't given any interesting problems to solve with them.

Then I hit Calculus, learned how to derive them all, and never memorized a single one again. (And was rather ticked that I'd wasted all that time on something that would become useless one course later. )

The hardest class in the usual sense of "My brain is full, may I go now? " was definitely Applied Linear Math, though. More matrices than a junior could shake a stick at, and it was a 2nd year graduate course; I was one of two students not working on a PhD. I did manage to pull off a good grade there, but partly because I won a bet with the professor.

Lol, 8th grade history. It was just because of the teacher. If we were to take notes, we had to use different symbols for questions, insights, facts and opinions. Like, you had to put a light bulb next to an insight. For facts, we used numbers. We had to draw a bubble (like a thought cloud) for opinions. And questions, we had to underline, twice. It was a weird class, And I never again had to use any of the techniques that he tried to incorporate into the class.

And he was focused that Christopher Columbus was the Devil(which was different than I had ever been thought up to that point); and his shoelaces had A,B,C's on them. And we watched a movie on how Wooden Barrel's were made(more boring than watching grass grow). That was the kind of teacher I was dealing with. This guy, with his 8th grade history, made college biology look like child's play. And he did it on purpose. We were only 8th graders, and now being in college, I still wouldn't wish that class upon my worst enemy. And I major in education. I still remember it 'clear as day' and it was 10 years ago, lol.

Calculus IV at college. I don't think it needs an explanation :-)

AP chemistry in 11th. Gosh the racist teacher and she played favorites. Sh. E just failed half of the students, not considering to their test grades, neither amount of work, but just if you licked her ass. She would give you tons of pockets of papers with some CRAZY equations to do, wouldn't explain HOW to, just if you come up to her and ask individually, and when you'd do that she'd call you an idiot for not knowing. Then she would throw a surprise test next day. Give you homework assignment for Friday and would ask for it on Wednesday and you basically couldn't say the word against, because she would start stressing out (she's in her 50's, probably menopause cycle) and so you'd have to get a 0 for not deserving it. The worst thing is that she couldn't get fired, because she was the only AP chem teacher in school and even principal fears her.

Well, chemistry lab is always difficult for me, mostly because I'm a huge klutz and have a tendency to knock over test tubes and water baths that make me lose an entire lab period's worth of work. And give myself nasty burns, both of the traditional and chemical varieties. :)

But probably the most difficult class overall was a graduate-level course that I naively took as a first-term freshman on religion in American politics. It was the toughest class ever, and the teacher didn't cut me any slack because I was a freshman, but it was so interesting and I learned a lot! And with a lot of hard work, I still managed a pretty good grade.

Well, I am still in high school.. but math is the most difficult class I have ever taken so far... simply because I suck at it so bad. Math just owns me... so its rather difficult.

The one where the teacher told me to cut and paste my answers, because he wrote the book. It was more of a moral issue than anything else

The most difficult class I've taken so far is chemistry. It's just hard to understand. Lucky I had a good teacher.