A nonpublic school that provides an educational program that includes grades nine through twelve shall offer and teach five units of career and technical education subjects, which may include, but are not limited to, programs, services, and activities which prepare students for employment in occupations relating to service areas specified in section 256.11, subsection 5, paragraph “h”. Instruction shall be competency-based, articulated with postsecondary programs of study, and may include field, laboratory, or on-the-job training.