When written examinations are required, they shall be held at such time and place as the board shall determine. The methods of procedure shall be prescribed by the board. A candidate failing an examination may apply for reexamination at the expiration of six (6) months and shall be entitled to one (1) reexamination without payment of an additional fee. Subsequent examinations may be granted upon payment of a fee to be determined by the board, but not in excess of Fifty Dollars ($50.00).