D.C. Mun. Regs. tit. 17, r. 17-406
If the statement of experience as given on the application and the endorsements are satisfactory to the Board of Examiners, the applicant shall be granted a license in the grade for which he or she applies without further examination.
An applicant who successfully passes the required examination shall be certified by the Board of Examiners for a license in the class for which he or she was examined, or in a lower class if, in the opinion of the Board, the applicant lacks either experience or requisite knowledge in the class for which application was made.
An applicant who fails to pass the required examination for a Class 1, Class 2, or Class 3 license shall not be granted another examination until a period of six (6) months has elapsed.
An applicant who fails to pass the required examination for a Class 4, Class 5, Class 6, Class 7, or Class 8 license shall not be granted another examination until a period of three (3) months has elapsed.
Each applicant will be notified by letter as to whether or not he or she passed or failed the examination.
D.C. Mun. Regs. tit. 17, r. 17-406