I'd love to teach at a grammar school. The problem with the school I'm at is it's notoriously known in the area for its poor teaching and also students that aren't achieving anywhere near the national average
By the nature of averages, not all children can be average or higher.
You've had it in for this placement school for weeks, if not months, with most threads including a dig at how you know more than the teachers there, the teachers aren't very good and so on. Without wanting to sound harsh, your recent threads showed that 2/3 through your training year you are not handing in planning in good time, and you don't like teaching children from their current starting point.
I've worked in schools in all 4 categories, each had their own highs and their own challenges. The idea of walking into a grammar school or outstanding school and all the students automatically sit adoringly absorbing the wisdom of the teacher is a fantasy.
A good teacher takes their passion for their subject and makes it accessible to the children sitting in front of them, regardless of whether those children are naturals in the subject, bright but apathetic in the subject, middle ability, lower prior attaining for whatever reason, currently dealing with personal issues, have no stable place to live, are living with mental illnesses, are weaker academically but really hard working, have English as their second language, and accounting for any SEN requirements (because SEN does not mean low ability).