Parents have to understand the teachers union are a power with little interest in education.
Then parents need to get involved and demand accountability.
"Schools do not fail. They succeed. Children always learn in school. Always and every day. When their rare and tiny compositions are "rated holistically" without regard for separate "aspects" like spelling, punctuation, capitalization, or even organization, they learn. They learn that mistakes bring no consequences."
Richard Mitchel, "The Graves of Academe"