seeker
"Presumably the school will be teaching them what they need to pass their GCSEs?"
Don't you feel you'd be better off replacing that "presumably" with a "hopefully"? Afterall, not all comps/secondaries are good and not all GS pupils are MC with supportive and employed parents
And you could use the same argument in a GS area, where English and Maths also form part of the 11+
Yet again, this has become a tiresome, anti-GS thread, where the OP originally started by asking if people had managed to home tutor successfully. If people (and not only those in GS areas) stop helping their children with homework, is that going to help the children (in useful ways) who need help because their social situation is disadvantaged? If the OP doesn't help their child, then how does that help to improve the GCSE outcome of the child used as an example? Are there possibly other areas, or facets of life in the UK that could be criticised and put under the microscope, to give that child a leg-up the ladder in so many ways and on so many levels, rather than banging on about tutoring, helping children with school work and GS?
I feel sad that there are still children like me living out there - I'm sad that having worked all his life, my DH can't get a bit of help. I want every child to have a good education and for social deprivation to be a thing of the past. However, it doesn't make me bitter because like a great many things in life, even with the best will in the world, I can't change it. It certainly doesn't make me want to no longer help my child with their work when they don't understand it. In what practical way would that help my child, or more importantly, the example child that TIP used?
OP, it can be done - I did it, I'm not a teacher an DD2 got a place at a fiercely competitive superselective. Have faith in yourself. My DD scored better than the local tutor's candidates (quite a lot of children didn't quite make the score needed). Tutors don't necessarily have magic wands and having spoken to another mum, it seems I was doing everything the tutor was doing and tbh, she said I actually provided more useful help.
Anyway, I shall leave you guys to it, as this thread has rather predictably gone the usual way and I always feel that repeating myself is wasted positive energy 
OP, please feel free to PM me if you want advice.