Hi, I'm writing on behalf of someone who's not very 'techy' with these things. I tend to sort out all his few iPad issues and many Windows 8 ones.
The problem was simple: he only has two devices - a windows 8 laptop and an iPad 4th gen on iOS 8, and though I had set up iCloud on both devices Pages (the only iWork app he uses) wasn't syncing. I was prepared to do a full system restore, until I had one last check in settings. It was simple:
1) Open Settings
2) Scroll down to Pages (among all other apps) which, on an iPad, is on the left-hand side of the screen. I believe on an iPhone it fills up the whole screen.
3) On 'Use iCloud', turn it on.
I'm not a very techy person - not compared to most of the people that post on these forums. But I hope this helps!