What was the hardest grade in school for you?

I'm currently in college, but I think the hardest grade for me was the 11th grade, my junior year of high school. That was when I had a math class that I wasn't doing very well in, and I think I also had chemistry which was another poor subject for me. My senior year of high school was much easier because I no longer had any math classes and I had less classes altogether.

I am a sophmore in college.