The commission shall adopt rules to standardize the procedures for entrance and promotional examinations. The rules must provide:
(1) that each applicant have adequate space in which to take the examination;
(2) that each applicant be provided with a desk;
(3) that the room in which the examination is held have a public address system; and
(4) the maximum number of times an applicant may leave the room during the examination and the procedure each applicant must follow when leaving or entering the room during the examination.