My Catholic school did not teach the specifics of the faith very well. Unfortunately, this was the case in a lot of Catholic schools in the 1970s. They got too into teaching generalities, “love one another”, “explore your relationship with God”, and pushing a lot of social justice.
Many of these Catholic schools, including the one I attended, have since closed or consolidated.
I would say about 80 percent of what I learned about Catholicism growing up came from my Catholic mom either teaching me, or me just seeing how she and my convert dad went about their faith, such as stopping in to church for a “visit” to Jesus, going to Eucharistic Adoration, saying the Rosary as a family, going to Mass on Sunday as a family and afterwards often discussing the homily, etc. Probably about 10 percent came from stuff I learned in school (mostly from the small handful of older Sisters who were still teaching) and another 10 percent came from me reading out of books on my own.
I agree with TK421 that if you don’t see your faith being actually practiced and lived out at home, you’re not going to learn it very well from having some religion classes and the occasional school Mass.