In the hills, I can empathise with your son. I hated school, every second I was there was a torture, being treated like an idiot almost like a criminal because I didn't "fit in" or comply or conform, or learn much more than I had at Primary School come to think of it.
One of my grandsons is the same. He's going to a school after the holidays where the emphasis is on gardening, animal husbandry etc. rather than on academic success. If he feels so inclined he can do all that when he's older (he's 13) I think he felt pressured when he first went to Secondary school, too much was expected of him.
How many folk remember Grammar School and Secondary Modern. A much better system in my opinion and these days you can do your "levels" as an adult. A friend of my elder daughter never went to school, she hated it so much and was in constant trouble with the authorities. When she was 27 she took A levels and now, after much hard work has her Doctorate.
A niece gained her BA when she was forty. I still have bugger all