The other big issue coming down the tracks is going to be tutoring.
I'm tutoring in a few subjects in Y11 due to DD's SEN and to help her achieve her target grades.
But in asking around for tutor recommendations I've been truly shocked at what has come out.
Friends whose children got a full set of 8/9 grades and are at really sought after state schools have admitted that they tutored in ALL subjects weekly for the whole of Y10 and Y11.
Pretty much everyone had tutors for a couple of subjects in Y11, but it wasn't just one or two who have admitted to the full set for 2 years (and are keeping them on for A level subjects). The cost is phenomenal - if you reckon 40 weeks for Y11 at £50/week per subject, that is 2k a go. But then £16k for a year is probably a decent investment if you are targeting very selective 6th forms.... and no VAT (and you can tick the state educated box for university offers).
It does mean that you can no longer rely on scores as an indicator of how well a school does for it's cohort, and also massively disadvantages children in the same school in terms of sets, and in terms of teachers actually knowing what is happening in terms of their class and what they are secure on or not.
DD says even the kids are starting to ask each other if they are tutored if someone gets a particularly high score in mocks or class tests.