You might have noticed the absence of a Modify button on the toolbar. Without such a button, you can't modify an existing student record. Can you add the necessary toolbar button and message handlers? The most difficult task might be designing a graphic for the button's tile.
Recall that the CEx15bView class is just about ready to be a general-purpose base class. Try separating the CStudent-specific virtual functions into a derived class. After that, make another derived class that uses a new element class other than CStudent.