Failure of an applicant to appear for an operator's or field representative's examination after proper notification thereof shall be grounds for forfeiture of the examination fee, unless the applicant requests and is granted a postponement not less than five days prior to such examination or is excused by the board, for good cause, from complying with this requirement. An applicant who receives a postponement of not more than six (6) months will not be required to file a new application.