California Registered Dental Assistant Examination Pass Rates:

 2010: Written Examination 100% - Practical Examination 96%

2011: Written Examination 96.5% - Practical Examination 88%   

2012: Written Examination 90.5%-  Practical Examination 100% 

Dental Board of California Passing rates:  http://www.dbc.ca.gov/applicants/rda/wes2010_2011.shtml