No person shall, either by himself or in cooperation with any other person or persons, wilfully or corruptly defeat, deceive or obstruct any person in relation to his right of test under the provisions of this part, or falsely mark, grade, estimate or report upon the test or standing of any person so tested hereunder, or aid in so doing, or furnish to any person any special or secret information for the purpose of either improving or injuring the rating of any person so tested, or to be tested, or the prospects of any such person for appointment, employment or promotion.