I believe that with my skills in (mention skills relevant to the position) I can be a valuable asset to your company. I have enclosed with this letter my resume which I hope is satisfactory and meets all your expectations. My resume contains a more in-depth detail about my education and previous work experience.
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.