(a) The head of each regulatory agency may classify commercial applicator and noncommercial applicator licenses under subcategories of license use categories according to the subject, method, or place of pesticide application.
(b) A regulatory agency head shall establish separate testing requirements for licensing in each license use category for which the agency is responsible and may establish separate testing requirements for licensing in subcategories within a license use category.

(c) Each regulatory agency may charge a testing fee, as fixed by the head of the regulatory agency, for testing in each license use category.