My recommended strategy for preparing Christian kids for college

In the last two weeks, I have been gathering information about the problem that Christians parents face when they send their Christian-raised kids to college. Specifically, I met some excellent Christian parents who seem to have done a great job of raising their kids in private Christian schools and had good consversations with them about policy and apologetics. Yet, these kids still dumped their faith and their conservatism in college. What to do?Well, I can only go off of what I have seen from