I have had students in my class that started out with low grades, & they would say,"I don't understand it, I got student of the course in my electrical class. I just can't seem to get these transmissions!" It would appear that they would start to slip into a very reserved mindset, becoming almost withdrawn.
I would take them to the side & encourage them by letting them know that certain people do better in certain subjects, but they are more than capable in this one, it may just take more effort.
Usually, they would pick up & start to… >>>