Here is a link for the reciprocal States that you could obtain other licenses in, if you are currently a North Carolina Licensed Agent: http://www.ncrec.state.nc.us/applicants/reciprocity.pdf
The link here is for the California Out of State Applicants which should provide you with the information you need: http://www.dre.ca.gov/Examinees/OutOfState.html
Also, the link below does provide for testing centers within California, and it seems you must actually take the exam there.
I am in the Mortgage Business with a Nationwide Direct Lender and I hope you will reach out to me offline as we could possibly establish a working relationship. I am sure you will not receive any information on your request other than what I provided as I take it upon myself to research as much information as possible to help those I feel I can provide accurate information to.
Send me a direct email to let me know how you make out and I can forward some mortgage material to you to review. Thank you and have a great day!