S.C. Code Ann. § 40-47-150
In case of failure at any examination, the applicant shall have the privilege of a second examination with the payment of the regular fee. In case of failure in a second examination the applicant, to be eligible, in addition to the requirements for previous examinations, must have pursued his studies for such time as the Board may approve and furnish satisfactory evidence thereof.
(3) other special or compelling factors presented by the applicant to the Board.
If an individual is granted special permission to have the results of a fourth taking of the examination considered and he still has not passed the examination as required by the Board, no further attempts at or scores from the examination shall be considered by the Board.
If the applicant has not met the Board's criteria for passing the examination after three takings, he shall not be permitted to retake the examination and any score received after three takings shall not be considered except by special permission of the Board. It shall be the responsibility of the applicant to demonstrate special or compelling circumstances in order to have a fourth taking considered. A petition for special permission shall be filed with the Board setting forth in detail the special or compelling circumstances the applicant wishes the Board to consider. These special or compelling circumstances include, but are not limited to, the following: