When can I take the APTD Exam? Teona McCutchen Updated November 21, 2018 16:00 Follow The APTD Exam is offered during several testing windows throughout the year. For the most current testing windows and registration deadlines, please see www.td.org/certification/aptd/exam. Related articles Where do I take the APTD Exam? Are there APTD and CPLP testing centers outside the United States? How do I apply to take the APTD Exam? How much does the CPLP cost?