Final answer:
The primary organizations responsible for educating new and existing real estate license holders include state-level Real Estate Commissions or Boards and national organizations such as the National Association of Realtors.
Step-by-step explanation:
The organization that primarily focuses on the education of new and existing real estate license holders is typically a Real Estate Commission or a Real Estate Board at the state level.
Alternatively, there are also national organizations like the National Association of Realtors (NAR) that provide extensive educational resources and continuing education programs for real estate professionals. The education is crucial for licensees to stay current with the latest laws, regulations, and business practices, as well as for the preparation of licensing exams for new agents.