Each semester, students select the courses they need to take during the time period specified in the academic calendar via the OBIS system and submit them for approval to their advisors. The OBIS system displays the courses to be taken in blue, the courses successfully completed in green, and the courses failed in red. Students choose the courses they need to take within the relevant year according to certain priorities. Priority is given to retaken courses or courses taken as make-up. Students who register for their own semester courses may, if eligible, choose courses from upper classes. It is important to pay attention to the warnings and guidance of advisors in this regard. During the course registration period, advisors inform students about the elective courses opened within the semester. Among these courses, students choose based on their interests and needs. There may be elective courses from the previous year that are not opened during the course registration week. In this case, the system shows you a table of alternative courses that can be taken instead. It is important to take courses from the relevant package and year instead of the missed elective courses. Do not hesitate to ask your advisor if you are unsure. Remember that during the course registration and add/drop weeks, your advisor may send you messages, indicating that there may be errors in your course registration or changes may be necessary. Regularly check relevant messages and remember that changes may still be needed after your course registrations are approved.