I would like to know if there is a way to add an additional page that is teacher-designed to provide the students with more practice in writing code?
@ava.martin, Thanks for your message. Are you looking for more practice in unit 2 (web development) or unit 3 (Game Lab) or something else? Most of the lessons do have a free play component at the end of each unit and you could make assignments for them to complete there. They can also create projects outside of the curriculum here (web lab - https://code.org/educate/weblab) or here (game lab - https://code.org/educate/gamelab).
Hope this helps!