I'm amazed the school does setting at key stage three as the majority don't.
Whilst I see flaws in mixed ability, they work in terms of not creating sink sets.
Personally though, I'd have a top set (gifted/talented cohort) a nurturing group and the rest all mixed ability, for precisely the reasons you give.
"The behaviour and disruption in her classes is unbelievable. She says most of the lesson is spent telling off students, warnings being written out and kids being sent out, chairs being thrown, kids talk through the lessons and most of her lessons are being taught by supply teachers who just give out a work sheet and aren't bothered if the work is done or not."
Supply deliver what they are told to: although you can zhuzh up where you can, if you are given worksheets to hand out or textbooks (turn to page x) or told to ask them to make a sodding poster or mind map (with no materials other than a blank piece of A4) then you cannot make a silk purse out of a sow's ear, especially if you have no access to the smart board/laptop etc
Supply and Cover Supervisors often are bothered, but the nature of the job whereby classroom management trumps delivery (i.e. don't let them kill each other) means their hands are full trying to minimise the disruption and provide a safe learning environment. This is especially true when you might be Day to Day Supply #20 the children have had. It's a vicious circle.
A few of the teachers have even commented that she is the only one who does the work. Mine had this in French. They have now "solved" the issue by removing it altogether and they all have to learn Spanish instead as they couldn't get a specialist. They had a glut of supply and were doing booklets for months on their own (self-taught/independent learning). This is why noble starts the threads that she does about teacher retention.
The higher sets only get occasional supply teachers. If that is true, then they aren't levelling up and they are merely trying to protect their 5+ students. Most schools will spread out a specialist on rotation if a long term absence hasn't been filled. You are correct that children are being written off otherwise.
At the moment, her class does not have a proper maths or language teacher.
Doesn't surprise me at all.
Every teacher he spoke to said she needed to be in much higher sets. I asked when I could expect her to be moved and he said hopefully by September but there's no room in the higher sets so he didn't really know.
Strongly worded letter to the Head and the members of SLT in charge of Teaching and Learning/Behaviour, quoting what the HOY has confirmed.
Can I insist on having her moved?
Insist, no.
Make yourself a nuisance until they find a spare desk and chair, yes.
Be that parent. Write the letter expressing your concerns.
If you have your daughter's SATS scores and raw scores and their reading age, even better.
Copy in the Chair of governors.
Ask daughter to make a log of all her lessons (quick note on who taught and task set) from now until Whitsun. Write again.
Mention how resilient your child has been but that her mental health, wellbeing and confidence are suffering as a result of being in a group not tailored to her ability (making it a safeguarding fail their end).
If they insist there is no space in a higher group then ask for the work that is being set to be given to your daughter to complete in the Emotional Support Unit, until they make space there is.