Back in the 80s, I worked with a rabid black Muslim who sent his kids to catholic schools. Of course when I went to RC schools, grade school through 10th grade of HS. The first class of the day was catechism.
Our local Catholic high school gets Catholic theology....I know because I take Bible study from the nun that teaches it. I know she is teaching it right. I hope at the high school level that they get more than the catechism, which is what my RCIA group is reviewing with our adult candidates. This is my first year on the team, so I am observing and learning what they teach there myself. I think adults should all go through a continuing education program. I highly recommend Bible studies for Catholics, too. We should never stop learning and growing in our faith.
Lest I forget, our priest teaches at my church’s Catholic school. He teaches 5th graders religion. I know they are getting it right there, too.