[RK]

When I was an undergrad, organic chemistry was widely considered to be the hardest. They eventually released some grade statistics like the ones you mentioned and it showed that organic chemistry had the highest mean grade and the highest percentage of A+'s of any course.

Of course it was full of pre-meds and chemical engineering majors (ie. pre-oil). Draw your own conclusions.

The departments that had the lowest mean grades across their courses were physics and economics. I took that to mean that physics was actually a very difficult major (I admit I'm biased here). Economics, on the other hand, was what most of the scholarship athletes majored in (my university didn't offer communications or marketing degrees that you sometimes see). Not to say that economics wasn't difficult, though I never had a chance to take any courses.