I would recommend contacting one or more of the following sources to find out about any required reading list(s) for your school, and opt out policies. I believe you can always opt out if you deem a particular book inappropriate. There are certainly many reasons a parent might not want their child to read a particular book. Anyway, here are the aforementioned sources that you might contact.
California State Board of Education Staff Rae Belisle, Executive Director
1430 N Street, Room 5111, Sacramento, CA 95814
Phone: (916) 319-0827; FAX: (916) 319-0175
Karen Steentofte, Chief Counsel
Deborah Franklin, Education Policy Consultant
Debbie Rur, Education Policy Consultant
Maryanna Rickner,Legal Assistant
Cathy Akana, Executive Assistant
Robin Jackson, Executive Secretary
Or, you could czll the state Senator or assembly Member for your area - or a local school board trustee.