The deadline for withdrawing from all classes is Friday of the 10th week of the quarter. (You may not drop individual classes after the 8th week.) For the winter quarter, the deadline is TODAY (February 21st) at 4:30 pm.
Withdrawal forms are available on the wall outside of the Registrar's Office (CC365) and here.
These forms must be completed and signed by the IT Department, Counseling Services, and Housing (if you are living in the resident halls). The withdrawal form must be received by the Registrar's Office before the deadline. Each student is responsible for his or her academic schedule. Failure to withdraw by the deadline means that you will receive a final grade in each of your classes.