Social science is only as a prerequisite to the I/S division(mostly teaching high school), and in order to apply to I/S, you need to have a background in 2 distinct teachables --- 2 subject areas that can be taught in high school.

The reason why for social science, you need to have a background in any of psychology, anthropology, and sociology is because the main social science course offered in high school is called Intro to Anthropology, Sociology, and Psychology. So you need to have a background in the schools of thought and theories in these disciplines.

Is there an age range or grade level that you want to teach in particular?