According to article 21 of University Academic Policy, a student may discontinue from all classes until the first tuition payment deadline of each semester, meaning:
Discontinuance within these time frames releases student from payment of remaining tuition installments. The discontinuance applies to the entire school year or one semester, based on the registration for that school year.
Requests for discontinuance must be done through Academic Management Services, for just as it is necessary to formally apply to the University, it is necessary to formally discontinue.
Without formal discontinuance, the student will continue to be considered a UC student and subject to tuition and any respective late fees.
Cancellation of enrollment/registration
Cancellation is now a separate action, and can only be done if it meets the general terms and conditions and only in the following circumstances: