Subsections (b), (c), and (d) of this section do not apply to a county if the number of members of the county board is regulated by other provisions of this title. If a county school system has an enrollment of less than 50,000 students, the county board shall have five members, except that: The Worcester County Board shall have the number of members provided in subsection (e) of this section; and Any county board that had more than five members on July 1, 1969, shall retain that number of members. If a county school system has an enrollment of 50,000 students or more but less than 100,000 students, the county board shall have seven members. If a county school system has an enrollment of 100,000 students or more, the county board shall have nine members except as provided in § 3–901 of this title for Montgomery County and § 3–1002 of this title for Prince George’s County. The Worcester County Board consists of seven voting members and one nonvoting student member from each public high school in the county.