U.S. Citizenship and Immigration Services (USCIS) has a collection of helpful resources and free study materials to help educators who teach adult citizenship education classes. Visit the USCIS Citizenship Resource Center to help find materials that can help you build curriculum and supplement classroom study materials.
I had my interview at the Dallas DO today May 14th. It went very well. I was very nervous about my extensive travel over the past 5 years. I had some 800 odd days of travel that included trips to a lot of countries in the world. But none of my trips was over 6 months, the maximum trip length was 110 days. I was working for a US company as a contractor and did have a letter from the company for the reason for the numerous visits.