Toughest classes taken in college?

I'm trying to gauge the difficulty of college classes, so for those in college or graduates, what's the hardest class you can take, and why are they challenging?

Understanding what makes a class difficult can vary greatly between individuals; it could be the course content, the professor's teaching style, or the amount and type of assignments. So, your experience may be different from others. However, many students find organic chemistry particularly challenging, and it's often known as a "weed-out" class in many pre-med tracks.

The difficulty arises from its abstract nature and the amount of information one needs to remember. Unlike general chemistry, where you learn broad concepts and apply formulae, organic chemistry is much more about understanding reactions at a molecular level. The course also demands a lot of time and effort, as you're required to memorize and understand many different reactions, mechanisms, and molecules. This may make it more demanding than other classes where the material might be easier to grasp or less intensive.

Remember, though, that a class being considered "difficult" by some doesn't necessarily mean it will be for you. Your strengths and interests play a big role in how you perceive a class's difficulty.