If you don’t have time to study the Catechism. You can study it through email in a year. flocknote.com/catechism
The study uses Youcat and not the larger green cover 1992 Catechism.
I’m not saying that it is good or bad, just pointing it out.
Check out United States Catholic Catechism for Adults. It is a red colored book and written very well. This is not really a reference book but something you can read through with biblical citations and bios of saints, it is also broke up in to readable chapters.
That’s a pretty cool idea. Although i think it would take much longer than a year if they don’t skip stuff.