Chemistry is super easy for me, I have a 98 going into my o-chem final. I guess it helps that I tutor and do supplemental instruction for general chemistry 1 and 2.
Statics isn't too bad, more challenging than chemistry.
Calculus-based physics on the other hand is giving me a run for my money. My first exam, I did not get a question wrong and still earned a low-B. Mega picky on grading and how he wants the problems solved. There are no assigned homeworks or quizzes, so I had no clue how picky he was. Second exam, I still got all of them correct, but skipped a step and received a 4-point deduction-haha. Ugh... I enjoy the challenge though, it forces me to pay greater attention to detail.
To date though, I'd say differential equations was the hardest, but I still have Physics III, transport processes for chemical engineering, and PChem all of which I hear make students cry during tests, literally.