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.Send the principal a letter saying you don't want your child to take the test. THIS SCHOOL is an amazing school and I appreciate the opportunity to refuse this test. The LAW says parents have the RIGHT to "Opt Out" for their child to not participate in the prep or testing of MCAS.