N.J. Stat. § 45:15C-16
The board shall develop an examination or designate examinations to evaluate the knowledge, ability, and fitness of applicants to perform as tree experts or tree care operators, respectively, and shall administer the examinations at least semi-annually at times and places to be determined by the board. The board shall provide for adequate written notice of the time and place of the examinations. An applicant who fails an examination may not retake the examination earlier than three months following the initial examination. There shall be no limitation on the number of times an examination may be taken. All licenses shall be issued on a biennial basis. A person may seek renewal of a license upon submission of a renewal application and the payment of a renewal fee established by the board. If a license expires without being renewed, the license may be renewed within one year of expiration upon the payment of a prorated fee. The determination of the board as to an applicant's qualifications for any examination shall constitute final agency action.
N.J.S. § 45:15C-16