When you push a huge rock that does not move, you get completely exhausted, but no work is done on the rock because there is no displacement.
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Yes, an example of an activity that would be considered ‘work’ scientifically is pushing a box across the floor, where the force applied to the box results in its displacement.
Kamali engages in reading books, drawing diagrams, organizing her thoughts, collecting question papers, attending classes, discussing problems with her friends, and performing experiments.
In common parlance, Kamali’s preparation for exams would be described as ‘working hard.’
According to the scientific definition of work, Kamali’s preparation for her examinations may involve very little ‘work.’