You don't need it. This is also the national unified examination. As long as you pass the remaining professional examination subjects within four years, you don't need to take the exam again. If you don't pass the exam within the specified time, your tax law score will be invalid. In this case, you will have to take the exam again. After passing all the exams, you only need to go to the place designated by the AICPA in the last city to get the certificate.