I wouldn’t want to move my children in Year 8 and 9, however, they are the ‘least bad’ years to be moving children from one secondary school to another. Year 8 in particular seems to be the year a lot of kids here move from one school to another, so they can get settled in before GCSEs.
However, I am going to tell the OP to get a grip. You would get a lot more sympathy and helpful responses if you ask ‘does anyone have any experience of moving schools in Years 8 and 9’ instead of wailing (and your posts do come across as wailing) about your privately educated children not being able to cope with a state school.
Not accepted by state and then washed hands of by private.
I must confess that any friends that ditch her because she has moved to a state school are nasty pieces of work and not friends. So don’t mourn the loss of those. They will be easily accepted at state schools, (unless they march around the place announcing that they are devastated to have to mix with the ordinary children,) they will just find other kids with similar interests and slot in with them.
Plus the facilities the private schools have that they use and won't be available. I wouldn’t be so sure about that. My DD is looking at a state 6th form for A levels. They have a lacrosse team and a polo team (and the year they went to the British Schools Polo champs, they were sneered at by the private kids, and then famously went on to beat them all.)
Also options as they do subjects not available to them. See above. The reason my daughter is looking at this school is because of their excellent Classics department.
I had a work colleague who had to swap his daughter from the local private school to a state school (the one both my kids are at atm) and he was similarly fearful, but on looking around the school he was amazed to find the facilities in some departments were actually better than at the private school. (He was astonished to find a massive music department, a small theatre and the photography suite complete with dark rooms. His DD’s private school had none of these things.) Don’t judge them before you have been and had a look. Some schools have different strengths, so decide what you need for your children and then look into schools that offer these subjects and facilities. It’s pointless going on about the facilities a private school has if your DCs don’t actually use that facility! And above all, don’t judge the state school kids - as other people have pointed out, somewhere in the region of 95% of all children go to state school, and deciding at such an early age that they are incompatible with the vast majority of other people is not a skill I would want my children to learn!