Hi @shuang bao
Microsoft Certification / Exams is currently not supported in the Q&A forums, the supported products are listed over here https://learn.microsoft.com/en-us/answers/products (more to be added later on).
You can ask the experts in the dedicated Microsoft Certification - Exams - Exam Registration and Scheduling forum over here:
https://trainingsupport.microsoft.com/en-us/mcp/forum/mcp_exams-mcp_exam
Please 'Accept as answer' and ‘Upvote’ if it helped so that it can help others in the community looking for help on similar topics.