My son goes to a Catholic high school and from what I’ve seen the school just seems to maintain closer relationships with the Catholic colleges as a whole. Our PSEO program is with the local Catholic university, not the public one, a lot of kids are steered towards the Catholic schools and they’re the only ones I know that actually do campus visits to the high school. I mean it makes sense that they’d want to support the Catholic schools so it’s not a huge surprise. But, I think the advantage is more as pp stated. The GC knows what those schools are looking for in an application.
Now, my son stated he will go to any school BUT a Catholic one. He figures 4 years of having to take religion classes are enough for him. 