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When a place in the course/class of your waitlist request has been confirmed, notification will be sent to your email box on the next day at around 1am. Therefore, students whose waitlist requests being updated on the last day of add/drop period will only receive notification after the lapse of add/drop period. If you are on the waiting list of a class and you no longer want to enroll, you should cancel the request disregard your queue position on the waiting list.