(a) Examinations for a license to practice chiropractic may be held in the time and manner fixed by the board.
(b) The examination may include practical demonstration and oral and written examination in those subjects usually taught in accredited chiropractic schools.
(c) A general average rating of 75 percent is a passing grade on the examination.
(d) An applicant may take a reexamination within one year after failing the examination.