Each applicant shall furnish evidence satisfactory to the Board that he is at least eighteen years of age, has completed at least four years of work in a high school accredited by the State Board of Education in the state in which the school is located or the equivalent of such work, satisfactory evidence of which must be furnished to the Board, has completed a course of study in an approved nursing education program, and has met other preliminary qualification requirements as the Board may prescribe. The Board may deny licensure based on evidence of unlawful acts, incompetence, unprofessional conduct, or other misconduct.