Maybe my standards are too low but these days I'm excited to talk to anyone who even has a passing interest in truth for its own sake, no matter what the quality of their inquiry is.
A) know ethics
B) have a love for the truth
It is harder to use ethics to lie to yourself or others. Ethics are a tool that can be used to justify heinous behaviour, or to shine a light on how your daily choices could be made better, all depending on those wielding the tool.
If you are wholly committed to young earth creationism, many college classes will be an unpleasant confrontation from start to finish and very little of your existing knowledge will help you pass classes even if you want to play along. People who come to college with more mainstream ideas will have an easier time and be more likely to succeed.
And it's not entirely surprising that graduates have a bit of a calcified worldview. If you read Marx without dropping out to join a revolution and were able to deal with a lot of compelling but conflicting arguments in whatever field you studied it's going to take quite a bit for you to radically change your mind.