The School «Monster High» has unusual students and teachers. And the tasks are also unusual. For example, throwing magic balls - conjure a colored ball and shoot other such balls on the magic board with him. To get "excellent" you have to clear the entire board of balls. To confirm the learned material and to be confident in your magical forces you have to do it several times in several stages-levels.
Drakualury probably has sunstroke and she is difficult to focus. She makes mistakes - a ready-made ball of the same color at the time of collision is transformed into a completely different one. The algorithm is unpredictable or is there some kind of pattern?
Try to understand until your doll monster was filled up with balls literary.