Seriously though, my school has a full-inclusion model in place. As the 7th grade art teacher and a 7th grade world history teacher, I get almost everyone who is in the 7th grade.
Art is a favorite place to put kids who have problems and are on a reduced class schedule.
The most valuable people to know are the resource teachers who work with these students with emotional problems. The next thing to do is to read the students' I.E.P's or Individual Educational Plans. There is a lot of good information about the student's special needs and educational goals. A talk with your school psychologist is also in order. Find out the background stories about these students.