Has he always been like this or is it a recent thing? Before you start thinking about changing schools try and find out why he hates school so much first.
It could be he's being bullied, or perhaps he finds some of the work tough. Have a with his teacher(s) and see if they know anything and generally how he is getting on. Do they have any concerns?
I terrible trouble with my son hating school, then I found he was being bullied because he was dyslexic and couldn't keep up with the other kids. He got there in the end though, and now his on a contruction and building course at college!
Please don't think for a minute I'm suggesting that this the problem, I'm just trying to give an example of what can cause 'school phobia'.
Hope you get it sorted