Each applicant for a license to practice as a licensed practical nurse shall submit evidence satisfactory to the Board that he is at least eighteen years of age, has successfully completed at least two years of work in an accredited high school or the equivalent of such work, satisfactory evidence of which must be furnished to the Board, has successfully completed the course of study in a nursing education program for practical nurses approved by the Board or has completed a course of study determined by the Board to be the equivalent thereof, and has met such 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.