Hi,
I live in old woking and have also done a lot of supply teaching in Guildford. GA has been having some problems lately. I haven't been there in ages but a friend of mine who was a permanent member of staff has handed her notice in as she says behaviour especially is really going down hill. Hoe Valley is looking like a good school but now they are more established they are heavily over subscribed and people in old woking didn't get in this year. Kings is probably the one I would be most reluctant to send my children too, but by all accounts it is really turning itself around and Ofsted are very pleased with the progress it is making. It was by no means the worst school i've ever gone into on supply.
Christ College is where most of the older children I know from Old Woking go as it was our nearest school before Hoe Valley was built. I would have no problem sending my children there, academically they are pretty good, but what they are very good at is pastoral care and nurturing children. Bellfields as an estate (where I lived before I got married) is really much better and a lot of people who live there now are young professionals who can't afford to buy in Guildford centre but want to have easy access to the station. I had no problems supply teaching at Christ's the few times I have, and the parents I know who have children there have no real complaints about it.
My advice would be to visit all the schools with no preconceptions, see what you think of how the school feels to you, talk to pupils and staff and don't just go on Ofsted. As a teacher I can tell Ofsted never gives you a complete picture.
As an aside I grew up in Cheam and about half my friends went to Nonsuch. They all had a horrible time there, it's very cliquey with a real emphasis on results at the expense of the child's wellbeing. I would be very reluctant to send any child of mine there.
Obviously these are only my experience and opinions, at the end of the day you have to do what you think will be best for you dd. Am happy you to pm me if you want k is more about the local schools.