There is normally a district approved list of books and the teachers select books from that list.

If you have the time, make an appointment with the teacher. Ask for a list of books they are using and what are the topics they are trying to cover and how those books work to cover those topics. Its best to get this information at the beginning of the year so that you can read the books prior to your kids reading them. When you find books that you have a problem with, contact the teacher and arrange for an alternative assignment. If you have a problem with a specific topic or you don't trust the information you are being given, contact the principal and schedule some time to sit in the class. This will have a negative impact on your kid's relationship with the teacher, but you will develop a reputation with the teachers and the administration of the school. They will handle you with the utmost of care. Ask me how I know. I'm sure I'm not the only parent who has done this. I'm extremely happy that my youngest has finished high school and graduates next week. Government schools are first and foremost government institutions. Treat them accordingly.