This happened to me in an ML class. Somehow people went from not knowing what eigenvalues were to solving all the problems in Bishop's book correctly and exactly the way the TA wanted them. A bunch of them would go to his office hours and have him do a problem, then they would share his answers.
I didn't complain until after the term was over and was just chatting casually with him while waiting for lunch at a food truck on campus. He was completely oblivious and didn't believe it.
I didn't complain until after the term was over and was just chatting casually with him while waiting for lunch at a food truck on campus. He was completely oblivious and didn't believe it.