Traditional classrooms function like courtrooms.
The judge of knowledge (the teacher) decides which evidence (information) is worthy of consideration.
In later grades, the test is the method by which students are allowed to prove their cases, their understanding of the material.
What if your child already understands the facts of the case, and becomes bored? Objection! What if your child is a kinesthetic learner, and will remember better by acting out what butterflies do? Objection!