Like ben said before, the ToC is build upon publishing, and thus have static components. Therefor you can either hide or show the table altogether, but not the individual items in the table. What you could do is the trick that ben suggested in some other topic. You could create invisible squares and place them on top of ToC-items, making the squares hide when your users finish a course, test or any page at all.Other than that, I do not think it is possible to alter the content of the table all by itself.
