hello Lisa
The report you have says CAT year 7 - so this data seems to come from when he entered secondary school aged 11.
A couple of common sense points elude educational strategists. One is that most people do not develop a reading age beyond 10-11. This reading age gives you enough skill to function fine in society. You may not read Dostoevsky but you'll be able to pay bills, work out what's being explained, and interpret some degrees of inferred meaning ie 'reading between the lines'.
Strange as it seems, schools are tasked by the government with trying to make people read better by keeping testing them. 'Go figure'.
You seem concerned about your son's behaviour - daydreaming and boredom with school are the default positions of pubescent boys. If he is not being aggressive and unpleasant, then you have a fine boy. If he is not keeping bad company, you have a good result.
As it stands, your son can hope to teach eg in an academy as a teaching qualification is no longer mandatory - this will extend to the free schools in a few years, and we'll be back to the pre-1944 position of anybody being able to step into a classroom and mind the kids. No disrespect to your son or anyone else, this is just a fact of history and of future politics. So what I'm suggesting is, given he isn't being awfully badly behaved, to me he sounds quite normal.
If he is somewhere on the autistic spectrum he can join a huge swathe of us. Just the way we are. Moderately dyslexic - OK so if he is diagnosed, he may be allowed extra time in exams. May.
ADHD - lots of controversy about the role of this as a diagnosis especially if it is suggested he have daily medication.
It might be that as his hormones settle down he is able to achieve better under traditional classroom expectations. Sadly, it's clear that he simply doesn't enjoy being cooped up all day with a pen shoved in his hand. His instinct, his body and his brain is telling him he should be out chasing down wild animals for the family cave.
With the support he has he is likely to get passes in the main subjects and I suggest it's better to love him, be there for him and not expect him to suddenly transform into a bookworm. The school have said he's lovely - try to accept that for now.