Sorry to hear that your son is having challenges at school. Here is a link to some ideas that may help your son with his hyperactivity. I would also add Lithium Quartz and Lepidolite as suggested crystals. Besides keeping the Lithiumand Lepidoliteon him, having them by his bedside at night would benefit him. For clarity and focus, I would recommend Fluorite to help him out.
I hope that these recommendations can be of assistance and that crystals grace your journey with love and light.
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Disclaimer – Crystals are not a medical treatment and should not be used as a replacement for medical care. Please consult your healthcare specialist for your particular needs.