21. (1) A qualifying examination shall be held at least once in every year or for the purpose of granting a diploma conferring the right of registration under this Ordinance or for the purpose of granting a degree after completion of higher study leading to a degree. (2) The examination shall be held on the subjects prescribed by regulations and the right of appearing at the examinations shall be restricted to candidates who have undergone a course of study in such subjects in the prescribed manner at a recognised institution. (3) The examination shall be held under the control of an examining body to be appointed by the Board duly approved by the Government on annual basis. (4) There shall be appointed a Controller of Examinations who shall act as Secretary to the examining body and, so long as the Controller of Examinations is not appointed, the Registrar shall discharge the duties of the Controller of Examinations as prescribed by regulations.