Out of state drivers license

I was pulled over for talking on the phone and i was cited for driving without a license even though i have a valid WA state one. The DMV book states that i need to apply for a drivers license within 10 days after i make California my state which i did but i been unable to pass the written test but the police officer told me that this does not count and that i need to have a valid CA license within 10 days. So how can i fight this in court? I been studying the handbook and the local DMV in my area was closed for remodel for almost a month so i haven't been able to re-take the test. I can't find anything that will back up the police officer claims. I been trying to get a license but since i work and go to school is kind of hard for me to make it to the DMV before they closed.