Pascarella and terenzini found that in the course of the college years, individuals become dogmatic, authoritarian, and ethnocentric in their political and social views.

I believe the answer is: Less, Less, Less

This happen because in college environment, students would be exposed and socialize with other people from various different background.
This situation would resulted in them developing more tolerance towards other people and reducing their prejudice toward people with different background.

Sometimes but itt depends, their is a lot if drugs on campus too so you really can't just say that