Which country for university student exchange: France, England, Sweden?

I guess it depends what you are looking for. Are you American? If you want a really different experience I would say don't go to England. You won't feel like you are really branching out and experiencing a different culture if you go to England. I have been to England, France, and Sweden and I would say Sweden would be the more "different" from America. People in France don't tend to be very friendly to Americans either. I would personally go with Sweden but it depends on what you are looking for. England probably has the better social life/nightlife out of the three.