Now THAT F/O epitomises CRM and diplomacy at its best!
A few years ago I was doing a FAA style type-rating in the USA. My sim buddy was a low time F/O who had not put in much effort during ground school and had barely passed. Come the oral quiz, the FAA Check Airman set the 'rules'. He would ask one of us a question. If that pilot did not know - or got it wrong - he would ask the other, BUT even if he got it right, the second guy still had to answer the question reserved for him.
Starting with the F/O - question: "what does this switch do?" reply "dunno". So, I get to answer it. Then my own question. Next round, same result, and next, and next. After I had answered about 20 questions in a row and the F/O had answered none correctly, the FAA guy tore him a new rectum like you would not believe, reminding him who he would have to fly with when we got home.
All the FAA man's questions were reasonable, with no numbers required to be memorised unless it was a limitation that could be read on a gauge or instrument. Unlike some checkies at home.