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Course enrollment takes place online during the announced period (usually a week long) prior to the start of a new semester. You should go through the Course Catalogue and make out your own timetable in advance. Be aware of the credit limits depending on your conditions. With the commencement of the semester, modification of your schedule is available through the same enrollment procedure for the first week only. After the modification period, you may choose to withdraw when you wish not to continue taking a course. The courses from which you have withdrawn may be taken again in the future.
Enrollment Period
Online course enrollment takes place from 7am to 4pm everyday over a period of a week. The enrollment period for current students is usually 1 month before the beginning of each semester: the end of January for the first semester and the end of July for the second semester. Freshmen enroll in February after receiving confirmation of their admittance and the period differs from current students. Refer to the link for this year’s specific schedule.
Enrollment Procedures
You must enroll online at http://sugang.snu.ac.kr during the specified period.
For a detailed guide, refer to the attachment.
Modification of The Enrolled Courses
You are allowed to make changes to your selection of courses freely for the first week of a semester ㅡ that is, during the modification period. Log on to http://my.snu.ac.kr to view your enrollment status. When you wish to make changes, repeat the procedures for enrollment. To drop a course, simply click cancel.

* Remember to check your credit limits allowed for modification at the top of the enrollment webpage. Should you reach the limit, yet need to make more changes, you must visit the Office of Student Affairs of your college or department and file a petition in person.
Enrollment Confirmation
Course enrollment is not complete without confirmation. You must fill out a Course Enrollment Confirmation Form and submit it in person to the Office of Student Affairs of your college or department within the first quarter of the semester. This step is necessary to receive grades for the courses that you have selected.
Course Withdrawal
Should you wish to drop a course after the modification period (the first week of each semester), you must withdraw before one-third of the semester has passed. Attain and fill out a Course Withdrawal Form and hand it into the Office of Student Affairs of your college or department with your professor’s signed approval. There are no limits to the number of courses from which you can withdraw and withdrawn courses are marked ‘W’ on your transcripts.

* Course withdrawal is possible after one-third of the semester has passed without academic penalties only in extreme circumstances proven with official certificates (e.g. medical certificates) and when the final exam has not been taken.

Summer & winter sessions are distinguished from regular semesters in that they are offered to students as a chance to acquire credits during vacations and are open to those who wish to take classes during these sessions.
Course Enrollment
Students in the following categories may enroll for these sessions:
i. Current undergraduate or graduate students (those on Leave of Absence included)
  Yet, if you wish to enroll for a session in order to graduate right after the session,
  you must have been registered for the previous spring/fall semester to be eligible to apply for the session.
ii. Students from other schools on academic exchange agreements with recommendations from the dean
iii. Students of foreign nationality from universities abroad with recommendations from the Office of International Affairs
  Relations

The enrollment period for each session is as follows:
i. Summer session: mid-May
ii. Winter session: mid-November

Credit limits for each session are as follows:
i. Summer session: 9 credits
ii. Winter session: 6 credits (effective 2008)

Enrollment is complete only with the payment of tuition fees.
Course Withdrawal
Courses enrolled in during summer & winter sessions cannot be modified, therefore the only choice is to withdraw.
The deadline is the halfway point of the session.
Tuition fees already paid will be refunded according to the following timeline.

i. Before the session begins: total amount
ii. Before one-third of the session has passed: 2/3 of the total amount
iii. After the one-third mark and before the halfway point of the session: 1/2 of the total amount
iv. After the halfway point of the session: no refund