Hi @金子圭太494 You can add up to 2 practice test per course; however each practice test can include up to 250 questions si you might need to break up your practice test. You can use the bulk uploader to do this process, instructors on how to do so are here
1. There is no way to convert the file to CSV from Udemy. You need to do it on your end. I found an article than can guide you on how to convert from Word to CSV here.