This document describes the process of opting out of PSSAs and Keystone exams. It was provided to ALL principals in the Philadelphia School District.Take a sample letter, and make it your own! To my mind, the best letters are: --specific in delineating what you are not allowing your child to do. I am unable to add an attachment to my application template. I forgot to add an attachment (for example, my résumé or cover letter) to my job application. STEP 1: Parent sends letter to the building principal that you plan to opt out. SAMPLE LETTER: Dear Principal,. Make sure you continue to apply correct format to all your letters. Free standing requirements - Contact your Medicare contractor for more information.