When a law school legal aid agency has been approved as contemplated in Code Section 15-20-6, a third-year law student or staff instructor regularly enrolled may be certified as a participant therein and authorized to practice legal aid as an adjunct thereof in such form and manner as the judge of the superior court may prescribe, taking care that the requirements of this chapter and the good moral character of the student or instructor are properly certified by the dean of the law school. Before entering an order authorizing him to practice legal aid, the judge shall further require of the student or instructor an oath similar to the oath required by an attorney.