Your email can be short and sweet. The below sample letter to school principals letting them know your child is opting out was graciously offered to CPS from a group of parents in Somerville.Opting out is an effective way to protest the overuse and misuse of standardized tests, which forces schools to focus on the demands of the tests. My son will not be participating in state standardized testing during the current school year. Mail to: Massachusetts Department of Revenue, PO Box 7012, Boston, MA 02202. The purpose is to let the administration at your child's school know that your child will be refusing the test.