[ providing educational services, namely, providing courses of instruction at the preschool, primary and secondary (K-12), community college, college, university, postgraduate, and nonformal/adult education levels; ] conducting classes, seminars, conferences, and workshops in all subjects or fields; arranging and conducting educational conferences and educational demonstrations; developing and disseminating of educational materials of others in all subject matters; conducting educational research and testing; television show, radio programs, videotape and motion picture film production services in the fields of education and other social sector areas; publication services of books, text books, magazines, and newsletters in the fields of education and other social sector areas