N.J. Stat. § 45:9-6
All persons commencing the practice of medicine or surgery in this State shall apply to the board for a license so to do. The board shall, except as herein otherwise provided, examine all qualified applicants for such a license. Every applicant shall present to the secretary of the board, at least 20 days before the commencement of the examination at which he desires to be examined, a written application for admission to the examination on a form provided by the board, together with satisfactory proof that he is more than 21 years of age, of good moral character, and a citizen of the United States or has declared his intention to become such a citizen. He shall also present to the board a certificate of the Commissioner of Education of this State showing that, before entering a professional school or college, he had obtained an academic education consisting of a 4 years' course of study in an approved public or private high school or the equivalent thereof. Any license issued to an applicant prior to becoming a citizen of the United States shall be a temporary license and subject to the provisions of Revised Statutes 45:9-14.
N.J.S. § 45:9-6