Any institution whose main facilities are located in the State and which was approved by the Department of Education in compliance with § 125 of Title 8, prior to July 18, 1972, shall be exempt from this chapter. Apprenticeship and training programs offered or conducted by persons, partnerships, joint ventures, corporations, political subdivisions, employers or employer associations for their employees or prospective employees or by labor organizations or associations of employees for their members or apprentices shall be exempt from this chapter.