My child's teacher is crazy

Has anyone any advice for dealing with a terrible teacher? This is a bit long, but I want to paint a clear picture.My son ("Eddy") is in 5th grade. We moved last summer, so this has been his first year in this school. The school is a highly praised, high ranking school.Eddy's teacher ("Mrs. Jack") is a terrible teacher and communicator. She has no control of her class and screams at them constantly. She sends out generic emails saying my child disrupted class, or failed to turn in an assignment, but when pressed for details she can never give any.She is extremely disorganized with assignments and homework. When I reach out to her for clarification on assignments, she never answers my questions directly or completely. Most of the time she never replies to my emails at all.I asked for a face to face meeting, and she ignored the request - instead she changed the subject.This is Mrs. Jack's first year teaching 5th grade, and it clearly does not suit her. She has taught kindergarten and 1st grade in the past, and students who had her then seem to have liked her. I don't know for sure since we were not in this school back then.My son has attended two other schools in his life and has NEVER had the problems that he is having this year. He was always a strong student and well behaved.For what it's worth, Eddy says Mrs. Jack's accusations are not true. Also, there have been multiple times when she said he didn't turn in an assigmnent and then magically found it a week later. Is it possible this teacher is a twisted crazy person who gets her kicks from tormenting her students?I don't know any of the other parents well enough to ask them their opinions or experiences with Mrs. Jack, and I don't want to be that new parent that starts trouble or gossip.My instinct is to go to the Principal and tell him all of our experiences. But with Eddy being a new student in the school, I worry that we will be perceived as troublemakers and Eddy will suffer for it in his future at the school. Also, Eddy tells me that when the Principal is within earshot, Mrs. Jack is a totally different person: sweet and caring, helpful, teaches in detail instead of her usual eye-rolling screaming self.Also, it is coming close to the end of the year. I wouldn't bother bringing it to the Principal's attention this late in the year, except for two facts: I am sincerely worried Mrs. Jack will find some reason to fail Eddy at the last minute, and my daughter will also be in 5th grade in a few years and I do not want her to live this nightmare with this teacher.Thanks for reading. Any and all advice is welcome. via /r/Parenting http://ift.tt/2pfmLlJ