A person who administers a program of secondary education at a public, private or home school that meets the requirements of this chapter may issue a diploma or other appropriate credential to a person who has completed the program of secondary education. Such diploma or credential is legally sufficient to demonstrate that the person meets the definition of having a high school diploma or its equivalent. No state agency or institution of higher learning in this state may reject or otherwise treat a person differently solely on the grounds of the source of such a diploma or credential. Nothing in this section prevents an institution, once a student has been fully admitted, from administering placement tests or other assessments to determine the appropriate placement of students into college-level course sequences or to assess the content thereof for the purposes of determining whether a person meets other requirements for a specific program.