I wonder ...
The original post is far from clear, but to me it sounds like the question might be to do with the use of rudder in the flare rather than the use of nose wheel steering on landing. After all one assumes that tne student has done Ex 5 and is able to steer the C152 on the ground.
Difficult to comment further without more information, but my suspicion is that this student is still some way off going solo.