Are you just looking for a job or are you genuinely interested in what this school has to offer you? It's important to know the values of the school and what they are doing for their students that stand out.
What are they doing for their teachers? How is their education program better than others? Maybe you want to grow in your knowledge or expertise teaching differently and the school offers the means to do that. Show how you share their values and discuss your passion for education.
Learn more about the school by talking to teachers who work there to get a better picture of their culture and their views on education. Research test scores or graduation statistics. Think about what is important to you in a place that you work and learn about how this school compares to your values.
"Your school has a reputation for creating a learning environment that encourages students to be open-minded and thinks for themselves. I want my students to be proud of their individuality and ask hard questions."
"I have had my eye on your school ever since I applied here for my practicum. My professor recommended your school, citing that he knew many students who came to teach here and loved it."
"I want to work at this school because you offer the growth I have been looking for, for some time. Your student body is substantial compared to my current school, and I see that you are more technologically advanced than many learning environments."