It depends on your school. The GRE and MAT are the most common exams required for graduate admissions in education, so if you haven't taken either, you may need to before you can apply to certain special education master's programs. This also applies if you took one of the exams, but your scores are more than five years old. Check with the schools you're interested in for further guidance.
No GRE or MAT scores are required for admission to SOSU's online M.Ed. in Special Education programs.