Crossword puzzle clue "in class work"

Opus ___ (Catholic teaching also called "the Work, work work work work")

Work, work, work

Work, work, work

"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