I suspect the reason it's so quiet is everyone is waiting for results this week!
Re. TGS, I actually have a son, but suspect it's probably similar to Tiffin Boys. I would say aim for GL and First Past the Post standard. Good to start on something lower (Bond?), but by January, you need to move up. Expect tough and little time in which to do it. So I would test under exam type conditions from the Spring. Try the Sutton mocks for practice, but do allow for the stress of the actual day, which is very different.
If they are managing GL at 80 - 85% by early summer, that's what you're aiming for.
The 11 Plus Exam Papers, available to purchase here, which our tutor has, are very good. Especially the Maths ones, so if you can get those, they are similar but slightly harder than GL.