two speed prop,
nitrogen narcosis and bends are 2 different things. NN affects become noticable below about 40m - it's like being drunk and the effects subside immediately upon assent to shallower depths. Other than the effect it has on decision making at depth, it's not dangerous.
I sat the same exam. There were a lot of Red Herrings about excercising after diving and before flying reducing the effects of the bends - didn't see anything about it in the syllabus. Anyway, I'm a scuba instructor - heavy excercise after diving makes DCS worse - like shaking a bottle of Coke before opening it (reducing the pressure) makes the fizz worse.