Doesn't matter when - middle school, grad school, somewhere in between.
Just wondering what the most difficult class you ever had in school was.
I withdrew from History of Theatre. Mostly because I just couldn't wrap my head around doing the work. I was an engineering/technology student, minoring in theatre. I was busy doing all sorts of shows, designing, building etc. If it wasn't hands on, I didn't handle it well. Also had a lot of trouble with my math classes (Calculus, Diff. Equations, Linear Algebra). I cut more classes than I went to in high school. In college I paid the price for that.
Calculus. I couldn't get past imaginary numbers. I probably should've worked harder in class. And I liked math.
I struggled with calculus in college, too. I got through it though.