The key component of a clear opt-out text message includes clear instructions on how to opt out, including opt-out keywords and sending the customer an unsubscribed confirmation text. For example, “Reply STOP to unsubscribe.”
Dear Principal Name, I wanted to let you know that my child, name, will not take part in the name the test this year. We ask that you make arrangements for him/her to have a productive educational experience during the testing period. Thank you for all you do.