I understand that my notice period is (Notice period) weeks, but I have been asked to join my new Employer (Date requested to start). Therefore, I respectfully request that you waive this notice period and relieve me of my duties immediately.
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.