Just going back a bit...what Curlew said about it being a game. It totally is.
Round here (we live near one another - not mates or anything IRL though, so I am impartial) there are the parents who get tutoring, and the parents that don't. It skews the results, of course it does.
Tutoring costs a packet.
It is also an opt-in and not everyone is even aware of it.
We went along to a couple of tutor group sessions where the kids were plied with sweets every half hour, taught how to answer the questions, deal with the format, I don't know, it was definitely something that would help with the test if you could afford it.
We couldn't, and anyway I thought it sucked. The people running it were like dogs with bones...and I hated the whole thing.
Ds's friend's parent wanted ds to go for some reason, as his ds was going (didn't need to, he's very academic) and they have plenty of dosh so he offered to pay when I said we were jacking it in.
I refused - not because I don't want ds to pass, but because I hated the set up. And ds didn't enjoy it much anyway, only the sweets.
I did test papers at home with him but not very many. Because I think he wasn't that bothered, and it didn't come easily to him. It was counter intuitive to push him.
We are at the mercy of a system that will favour the cleverer children and those more familiar with the format and so on...some people can afford to pay for this, some cannot.
However well ds does, if a load of kids do better, they'll pass and he won't. It's very competitive. I hate it. I wish we lived somewhere else.