If you resign during the school year (i.e. Under the Texas Education Code, contract employees are required to resign no later than 45 days before the first day of instruction for the school year.Below are examples of resignation letters for the school administration and principal, coworkers, and parents of students. I will go over a step-by-step resignation template letter you can use, how to structure it and provide examples of resignation letters. In this article, we'll guide you through the essentials of writing a resignation letter when going back to school, ensuring you leave on good terms. If you are unsure about signing a document, call HFT at 713-623-8891. This guide will provide you with helpful tips and advice on how to write a clear and concise resignation letter.