Kendriya Vidyalaya Sangathan — teaching education

I am a student of class 11 science of kv coochbehar. The teacher of chemistry is very bad. She always copies answer from guide books. She does know any proper method for teaching. We have made complaint several time but principal has not taken any action because he has some illicit relationship with that teacher.
SHe does not have any voice and always gives wrong notes from guide book...