1. Any person who is eighteen years of age or older may enroll in an adult high school if he or she has not earned a high school diploma.
2. An adult high school shall give a preference in admission to those students who receive any local, state, or federal assistance in which a person or family is required not to exceed a certain income level in order to qualify for the assistance.
3. For the purposes of compiling and tracking dropout rates of a local education agency by the department of elementary and secondary education, a student transferring from a local education agency to an adult high school shall be considered a transfer student and not a dropout student from the local education agency.