To be a social worker.. depending on the type of work one
intends to go into.
I think for councellors, one has to have a councelling degree, or
diploma, or certificate.
To be a Psychologist, one has to have a Masters in Psychology or
any Psychology-relevant courses.
To be a Psychiatrist, one has to have a Medicine background of a
specific area that one's specializes in.
To be known as a Doctor or Professor, you'd need a phD. 