You might find the 'Chinese Parenting' post interesting...
Assuming your ds's prior learning has been equal to the norm, if he needs this much coaching to attain a place at an elite school then he'll likely not keep up or enjoy it once there. To most on this site, your regime, the early mornings, will seem very harsh.
An anomaly is you say he has the ability. Why such a regime then?
If he does indeed have the ability then you need to listen to your son more - you say he is resenting the intensity! I would be looking at ways to make learning enjoyable at his age not how much you can 'fit in'. He's young and compliant and wants to please you at 8 years old. There's a danger when he's older that this regime if it continues will in hindsight have been a bad idea. Be careful, be mindful. First think of your son's happiness and well being - physical and mental. Grammar school is not for everyone and not a means to a successful, healthy, happy life.
I wish you and your son well.
Thanks Belinda, I think I just need to learn a little self control and stop applying so much pressure on my son. Part of my problem is that when I have a goal, I allow that dream to become all consuming.
He has been assessed by four different tutor/teachers, who have all confirmed that he is very able and his school teachers have all reiterated this, so perhaps I just need to relax a little.
Thanks again. Your comments have been noted and are appreciated.