California Code, Business and Professions Code - BPC § 8623.5

(a) A person whose license or registration has been revoked, suspended, or surrendered, or who has been placed on probation, may petition the board for reinstatement or modification of the penalty, including modification or termination of probation, after not less than the following minimum periods have elapsed, beginning on the effective date of the decision ordering that disciplinary action:

(b) The board may require an examination for reinstatement of a license revoked or surrendered.