@ breadandbutterfly -
Of her group of 4 friends who tried for grammar school, the 2 who had exclusively paid tutors both failed. My dd, and her friend who had parental assistance as well as a tutor, both passed. In my (v limited) experience, therefore, tutors aren't as good as a motivated parent - they just don't care as much and I would guess are rather less efficient (as well as more expensive) because they don't know your dc as well as you do, so can't pitch it as accurately as you can.
This is very interesting, and interesting as well to see quite a few parents here report their kids passing without private tutoring, but always with some degree of parental tutoring (albeit sometimes minimal).
I very much agree with the above. DC had a private tutor for two terms as we were new to the area, didn't know the ropes and wanted to be safe. But to be honest, apart from pointing out some basic stuff in the first few lessons I was unaware of, she was pretty useless. I could see it not really going anywhere and stepped in to support him myself, producing my own materials and carefully monitoring his progress, timing etc. In the end he sailed through.
In fact I find the above to be true generally of educating kids. The support that a reasonably educated and aware parent can give is often massively more effective than that of a much more trained specialist. There's more dedication behind it, it can be far more customised and can work flexibly around the child's life.