Just to reiterate and upon reflection I wouldn't recommend the above tuition centre if you are only doing Bucks as they do alot of work which would be irrelevant.
We also spent a huge amount at this place and I wouldn't say it wasn't worth it, but we did do loads at home, meanings/opposites/similars/families/groups/compound words etc. etc.
I found this site/forum in May last year and it definately gave me a vast amount of knowldege re the 11 plus, as this was the first time we were going through this process.
I don't think ds would of got through if we did'nt do work at home, you can't really rely on tuition alone, I know a fair amount of kids that didn't make it on outside tuition alone.
My ds would get very miserable and would not concentrate at home and we were struggling on the NVR hence opted for this centre.
I'm glad it is all over as felt sometimes was'nt giving the younger 3 siblings enough time. It was hard work and I'm glad it paid off.
I felt like I was on a course myself