You can drop any of your class you've already registered up until the Last Day To Drop Class (see
http://dsa.csupomona.edu/registrar/c...emoduleid=607).
Always note when the last day to drop the class if you need the partial or full refund. Adding classes are only during the registration and late-registration period.
Dropping class a week before the fall quarter is not a problem. Simply access broncodirect and go from there.