Good to hear his headaches are giving him a break. I agree with the no napping but he should not be pushing through the headaches. Has he tried any gentle swimming or other mild effort exercise ? The Buffalo Protocol rule is to do activities that stay below the headache or other symptom threshold but not to be seriously cognitively active with a headache or other symptom. He may benefit from wearing foam ear plugs at school to lower the cognitive load. Sitting at the front of the class would also be best.

My best to you both.