I never understand the thinking behind the "move them for 6th form advice".
Firstly, 6th form is the worst value for money in that you pay 6 terms fees for 5 terms teaching. It also has less teaching hours than any other school year. Add to this the cost of paying for exam entries etc in the final terms bill and it is by far the most expensive for the least return of any of the school years.
And I've never understood why anyone would move a pupil who has achieved fantastic results at a state school to private for 6th form unless it is for specific subject choices. Just why? Whatever happened to the idea if it aint broke don't fix it?
Also, by the time they are 17/18 they should be well and truly independent learners and capable of working on their own. Good A level results are dependent on someone being able to sit and work on their own, and or with a study group, outside of the classroom. Nobody gets top grade A level results by just working in the classroom.
IME 6th formers with free lessons are used extensively by schools to take potential customers/pupils around on open days, exam days, interview days etc. DS's school had 7+,8+,9+,10,11+,13+ and 16+ entry it was endless. These schools often also run "charity" compulsory voluinteering schemes and 6th formers are sent to help or annoy local state school teachers so that the private school can justify their charitable tax status.
IME 6th form is the worst value for money of any school fees and I just cannot understand why anyone would move then.