January 22 is Census Day. Any drops to your schedule prior to Census Day leave no record on your transcript.
March 12 is the Drop/Revision Deadline. If you drop classes between Jan 23 – March 12, you will receive a grade of “W” on your transcript. You are allowed a total of 16 hours of “W” grades.
Additional dates (including Spring Break and Final Exams) can be found on the Academic Calendar: https://studentservices.ncsu.edu/calendars/academic/#spring