Hayden Grier went from being a solid B student to a straight F student during the pandemic. "It just completely changed," Hayden, who is now 16, said about school in spring 2020. "That threw me off. No schoolwork got done." Switching to virtual school, then a hybrid model, then the return to in-person classes, was difficult for most kids. For kids with attention-deficient hyperactivity disorder, like Hayden, the switch in routine or lack of routine had an even bigger impact.