Subject to the provisions of Code Section 20-4-20, any other Code section of this article to the contrary notwithstanding, all decisions regarding the delivery of adult literacy and postsecondary technical education programs and services to business, industry, and individuals who are 16 years of age or older and who have completed or left the public schools, to include the awarding of high school equivalency certificates, shall be made by the Technical College System of Georgia. Commensurate with this authority, the system shall exercise state level management and operational control over adult literacy education programs, postsecondary technical schools, and adult vocational centers.