Cal. Penal Code § 31641

(a) The Department of Justice shall prepare a firearm safety certificate study guide in all of the languages described in subdivision (a) of Section 31640 that explains the information covered in the test in Section 31640.
(b) The department shall offer copies of the study guide at actual cost to a firearm safety instructor certified pursuant to Section 31635, who shall provide the study guide to an applicant for a firearm safety certificate pursuant to Section 31645 prior to their test date. The study guide may be provided as an electronic copy by text or email or as a physical copy. The cost of the study guide, if any, may be added to the fee described in Section 31650.
(c) The department shall update the study guide concurrently with an update to the test in Section 31640.
(d) The department shall notify a certified instructor of the requirement to provide the study guide to an applicant for a firearm safety certificate in subdivision (b).