In this section, “dually enrolled student” means a student who is dually enrolled in: A secondary school in the State; and An institution of higher education in the State. “Dually enrolled student” includes a student enrolled in a credit or noncredit certificate or license program, course, or sequence of courses that leads to certification or licensure at an institution of higher education in the State. A public institution of higher education may not charge tuition to a dually enrolled student. Subject to subsection (d) of this section, for each dually enrolled student who is enrolled in a public school in the county, the county board shall pay 75% of the cost of tuition for a public institution of higher education in the State. If there is an agreement before July 1, 2020, between a public school and a public institution of higher education in which the public institution of higher education charges less than 75% of the cost of tuition to a dually enrolled student, the county board shall pay the cost of tuition under the existing agreement. Every 2 years, a public school and a public institution of higher education may evaluate and modify an agreement made under paragraph (1) of this subsection.