I'd assume that contemporary social issues is very likely a lot better than English for someone interested in social work. I'd definitely stick with sociology and psychology for the two other subjects.
Afaik what units get studied varies a lot depending on the college and the teacher. However, I've had to do stuff like social stratification, sociology and the family, social influence, biological psychology, abnormal psychology and so on.
You'll be assessed through essays, research reports, presentations, etc.