There is no valid scientific or medical basis to mandate masks at school. It's pure scientism and politics. For anyone who believes that mask mandates should continue please take the time to educate yourself by listening to this panel discussion by a group of leading physicians. UCSF professor and infectious disease expert Dr. Monica Gandhi explains the current science very clearly.
https://peterattiamd.com/covid-part2/
https://profiles.ucsf.edu/monica.gandhi
Most European countries don't mandate masks for schoolchildren.