As someone whose whole life has been centered around education, I can assure you there is no “indoctrination” in the school curriculum. There is no surefire cause for lowered test scores, and the fact that our budgets are being lowered by the day makes it so we can’t find out exactly why or remedy solutions.
And yes, most school districts can and do ban cell phones, but that doesn’t stop children from bringing them in anyway or listening to the teacher to put them away