In Lessons I did as you suggested and created a Page (Week 1), with a subpage (Second Page), which also has a subpage (Third Page). I assigned them section titles, which unfortunately seem very out of place on a phone sized screen. Here's the way it looks: https://www.screencast.com/t/iFiMmAouz
1) Fix the Next button (top right) which only appears now as a slice.
2) Put the top and bottom "Back and Next" buttons on the same side of the screen.
3) Cause them to have the same behavior and to look the same.