My DS recently( last sept) attempted the AGBS exam, and we are out of catchment.
The best way is to make sure the exam format- AGBS is revewing the types of exam- as in taking out NVR, and inserting english, before looking for the tutor. But the types of exam, is not confirmed yet, but only in draft. Make sure the tutor that you employ knows this....as NVR might just show its head.
I cant recommend a tutor, as i am not in your area. But the place to ask would be local friends and parents of ther children attempting this exam in your area. Pls feel free to PM me if you need any tips or help. Trafford forum is very active forum
you might want to read so,e threads there for help. You will certainly find aloqt of info.
Good luck... And see u around