In A Wrinkle in Time, what is Charles Wallace's strategy for entering school next year? Do you think this is wise?

Charles Wallace was slow to learn to talk, not speaking at all until he was almost five years old, and then speaking in complete sentences. He is made fun of (and Meg has to constantly defend him) by the boys in the neighborhood. It is assumed that he is mentally challenged. However, he is unusually bright. When he enters school the following year, he knows that, as much as he is picked on for not talking, he will face serious bullying if the other children discover how mentally gifted he is. So he decides to let them think that he is not smart, holding out as much as possible from revealing the fact that he has a superior intelligence. While this is a reasonable method of self-protection, he will eventually have to reveal his genius level IQ; it will probably be discovered by his teachers. This will most likely cause even more bullying, since the other children will resent his deception and making them seem like fools.