Crossword puzzle clue "class with hard material"

Class with hard material

"Class of" class

Class where you might learn about class, informally?

Second in his class in West Point's class of 1829

History class: F -- “The professor ignored my attendance record and class participation, judging me entirely on ___”

Class, level or class level

Class within a class

Class that's hard to fail: 2 wds.