The student book is made up of 30 chapters, which correspond to the session materials in the teacher guide. The student book also includes the portion of Luther's Small Catechism covered in each chapter.
Nestingen opens the book with the simul, and this is the framing device for the entire book, which I found helpful. I read the student edition, in which each chapter opens with basic language from Luther's Small Catechism, plus explanations. Overall the Table of Contents is structured around the Ten Commandments, the Apostles' Creed, the Lord's Prayer, and ends with a section on the Means of Grace, which briefly discusses the Sacraments and the Office of the Keys.
Sometimes the language skews so young it becomes too patronizing. I had to remind myself I am not the target audience. This is clearly meant for unchurched pre-teens and young teens--junior high or young high schoolers. Very 1990s. Lots of stock photos of smiling people and inanimate objects. I wish they would do a new edition in a new design without the photos.
I had to read this for Confirmation, and it was very good. It answered a whole lot of theological questions that I had in a well-written, easy to read way.