Yes, you can. The deadline to DROP from the program without penalty is August 8th. You can do this by:
1. Logging into R'Web
2. Entering the call numbers for the classes you are enrolled in
3. Clicking the drop box next to the call numbers and change it to say "Drop"
instead of "Add"
4. Check your schedule to make sure you dropped the classes by clicking "Classes" on the left side and make sure the classes you dropped do not show up there under "Summer 2017"
The deadline to WITHDRAW from class(es), receive a “W” on your transcript, and NO REFUND for academic fees is August 28th. To complete the request to WITHDRAW, you will need to be submit a form, please go to http://summer.ucr.edu/" for instructions to WITHDRAW.