The Catechism helps us answer questions. I think you are approaching this the wrong way. To simply listen to the catechism will likely result in more confusion. It would be better for you to identify the things that you are curious about and go from there.
Why? It’s the “red car” effect. If I tell you before a drive to “watch out for the red car” by the end of the drive you will tell me, “There were SO many red cars out today. I think they were mostly red!!! There has never been so many red cars.”
But that’s not true, you noticed cars that were red because it was on your mind. There were no more or less red cars than there ever were.
It’s the same with reading books straight through like the catechism. You’re going to miss a ton because you don’t know what to look for. However, when you’re “in tune” with a question it will become meaningful for you, and provide you the insight you seek.