It's a waste of time writing to the teachers. They have little control whether or not common core is taught in the classrooms. Plus, many of them hate it as well. You're far better off writing to the admins and the county's superintendent.
It's more like FIX THE PUBLIC SCHOOLS. Only a small percentage of parents will either home school or send their kids to a private school. The other 80% of students are at the mercy of the public schools and all of the bullshit that happens there.
In other words, you can do anything you want to, just don't get caught. This applies to many activities besides using HAM radios.