Another ideas is "The Discipline of Grace - God's Role and Our Role in the Pursuit of Holiness" by Jerry Bridges. I think there is a study guide that you can get with it.

When I taught Williamson's shorter catechism to 5th-6th graders last year, some of the questions were too similar from the previous one. They were just not ready to dissect some of the questions to that degree. I had to do some improvising by combining some of the questions.

John Chaney

"having been firmly rooted and now being built up in Him and established in your faith . . ." Colossians 2:7