re: Hardest class or topic you had in high school?

Anatomy, sophomore year. Not sure how I even got into the class given my age. I was by far the youngest, most were seniors. Was similar to a stats or physics class were everyone “failed” but curved to a C or B-

I remember having a full deck of the 3x5 flash cards trying to memorize the skeleton and then getting to the test and zero skeleton questions.