According to your major and course arrangement, some students don't have exams, so they hand in their graduation thesis in May/June (equivalent to exams) and September. Some majors have both exams and papers (exams in June and papers due in September).

You can look at the curriculum on the school website first, and there will usually be an introduction. If you can't find the relevant information on the school website, you can also send an email to the college/professional for explanation. They usually reply in time.