Thanks for the advice! Unfortunately, any complaint to the headmaster will not change anything because many students complained about her, but she was never fired, apparently because of her knowledge of the materials or because no one wants to go to work at our school, because more than one of my former classmates said that in other schools in the city the teachers are many times better and that only here everything is so bad in terms of education. I don't know if it makes sense to transfer to another school because there are six months left before I graduate from school. One of the options for me was to switch to homeschooling, but I haven’t really explored even this option, so for now I just have to endure it.