We recommend the "Pillars: A Journey Through the Catechism" group study program. Presented by Dr. Sean Innerst of the Augustine Institute, it not only goes through the Catechism but shows how one can truly live the truths of the Catholic faith.
YOUCAT is the Catholic catechism for teens - and is super fabulous for adults. Seriously, I LOVE this book. And I may be "slightly" out of my teens, haha! Get the YOUCAT if you are interested in understanding the faith.
Contrary to what many believe, Catholic doctrine is not made up by popes and theologians but is derived entirely from revelation, as this book shows. In it, veteran Catholic apologist Dave Armstrong gathers in one place countless passages from Holy Scripture that point directly to the teachings of the Catholic Church.