Thank you all so much for your replies. I spoke briefly with the tester on the phone after I submitted this and she said that she she didn't know what happened with the comprehension. She has known him for a couple of years and couldn't quite understand why he wasn't getting the comprehension answers right. We were surprised too. He always seems to be able to comprehend books etc. She is a doctor of physchology and has done thousands of these tests and was unconcerned with the processing speed subsets because she said that this can sometimes in children with high intellectual potential.
Re mood/behaviour: His test behaviour was consistent and he sustained focus and exerted substantial effort on what was achieveable. He was quick to surrender on items that were not immediately apparent to him. Perhaps suggesting he is a perfectionist (all or nothing approach to academic challenges).
My son is 7 and in year 2. We have never had any concerns with Autism but were more concerned with ADHD as a small child because his mind and body were constantly on the move. As he has matured, this all seems to have settled. This is how we originally met the tester.
He has been at the same school for three years. He is young for his year, but has always academically been fine (picks things up quickly, never struggling, but just average to above average) and has a big personality. While academics have been fine, the teacher called me earlier this year to say that she felt he was bright and wasn't achieving his potential and that he was too laid back in class. She put him next to the brightest boy in the class and they are doing the same work. They have had testing done on four of the children in the year and have now pulled them out to attend extended maths classes. She wanted testing to back her up in being able to send our son. I don't know whether these are good enough to send him.
We didn't have any achievement testing done.
Re box: I was/am concerned that they will look at this and every report going forward will be poor for comprehension and good for the things that came up strongly (not that I fully understand what that is yet). Rather than using this to tap in and unleash potential and identify and areas to help him with. I am concerned that each new teacher will look at this report and have a preconceived view of his potential and lack of in some areas.
