Which college subjects TREC lists as related
TREC's page lists course topics acceptable for related credit when completed for academic credit through a college or university. The rule names the areas: accounting, advertising, architecture, business or management, construction, finance, investments, law, marketing and real estate. Within those, TREC lists topics such as principles of accounting and managerial accounting, business communications and business ethics, business and corporate finance and entrepreneurship, business law and legal environment, principles of management, and principles of marketing.
Many agents already have some of these from an unfinished degree. Pull your old transcripts first: a few business courses from years ago may cover part of the 630 hours.