Special needs students are all different because they have different disabilities. Each disability is different.
Teachers have to get special needs students to understand math and other subjects while straddling their disabilities. They use different teaching techniques then with the rest of the student body. Much of that has to do with creating a safe learning relationship with a good friend in class.
Special needs teachers take extra course work, like sign language, advance technology and other physiological skills.
Inclusion of special needs students in the culture and curriculum of the school is a major aim to graduating a good student.