Take notes from what students at GWMS in Alexandria had to do a few years ago to finally get mold addressed in their classrooms. A complete disgrace that schools ignore these building issues! Send your kid to school with a mold testing kit to collect samples if you have to. This absolutely needs to be taken seriously and remediated.
https://www.washingtonpost.com/local/education/we-can-change-something-these-13-year-olds-found-mold-in-their-schools-and-did-something-about-it/2019/06/30/5257de34-96a3-11e9-8d0a-5edd7e2025b1_story.html