Subject to the provisions of this section, an applicant who fails an examination given under § 21–304 of this subtitle may retake the examination. The Board may not limit the number of times an applicant may take an examination. The Board may adopt regulations to set conditions for retaking the examination, including a requirement that the applicant: wait a reasonable period between examinations; and prepare to retake the examination in a specified manner. The Board shall set fees for reexamination so that: the fee for reexamination on the entire examination does not exceed the cost of the required reexamination; and the fee for reexamination on less than the entire examination is less than the fee set for the entire examination.