Ditzy - the school are annoyed (with parents) because they have been repeatedly directed to do things differently - ie as set out in his statement - by the LA. This has related to non-delivery of provision, removal of provision despite lack of progress with no alternative provision, not sharing reports of external experts etc. The LA used to attend IEP reviews, write the targets, insist on delivery, review progress etc. The LA post has been abolished due to cuts.
We had to go to tribunal because the school insisted on 'using' all his hours during semi-structured and unstructured times and argued that there was no time left to deliver support in class. He now has dedicated support in all written lessons to provide scaffolding, writing frames etc with a specific behavioural modification plan to increase independent focus. So we do know the level of support, dates and times of sessions etc.
At tribunal the SENCO argued that DS2 didn't need any support at break or lunchtimes. Parents conceded. We have more issues than usual but this is not DS2's primary need. But after tribunal the school just reissued the provision map prior to tribunal, ignoring the Ruling and Statement and still insisting on delivering provision at semi and unstructured times (eg 5 hours dedicated support at lunchtime) and refusing to provide support in written lessons because they had used up (increased) hours. It is perverse.
At the target setting meeting, the SENCO eventually agreed to remove the 5 hours lunchtime support but the freed up hours were then used to deliver support during the early morning before lessons start (30 minutes each day) plus assembly and a 15 minute new intervention each day (eg 1 hour 15 minutes touch typing practice per week). Hence, there was still no hours left to provide support directed by tribunal. I phoned the LA who then phoned the school. The school then produced a new provision map but the head also banned any further communication with the SENCO and said that he had taken over. So when I was asked into school to meet the SALT, all school staff were absent. Didn't meet and greet, introduce, attend the meeting or even direct us to a room to have the meeting. Front door left open, no reception or office staff, no SENCO, CT, LSA or head to be seen. I was embarrassed on their behalf. Only the CT now attends an IEP review. This sort of behaviour does not inspire trust.
DS2 has a statement target to focus on all adult directed tasks, not just some of them depending on his own interest at that time. If a new topic captures his interest he may write 100 words one day but the next day he may have bored of the topic and struggles to write 20 words. His handwriting is twice the size and careless. There is no spacing, punctuation etc. Which day would you copy? You need both to see the pattern. You really need to see workbooks from different subjects over the whole period of the AR to see whether the pattern of on task/off task behaviour has improved as a result of provision. But it is possible to present snapshot evidence from good days to support a claim that focus has increased if we assume that, prior to delivery of provision, every day was a bad day.
The school has provided copies of work produced on a couple of good days in one subject during last term (there are no more examples). They have provided one copy of a single piece of work on a 'bad' day (there are lots more examples). They don't copy days when his LSA has had to write the date and title and DS2 writes 0 words.
The ratio of on and off task behaviour when following adult direction has always been like this and was recognised by his previous school. Their focus was on providing support so that more days could be good days. Progress needs to assess whether the number of 'bad' days has decreased and not whether he is engaged on some occasions. Obviously it is not in DS2's interests to claim that provision is adequate if it isn't, especially as this will have a huge impact on his experience of year 7.
The only way I have got him to engage with 11+ tuition is by using techniques specified in his statement. That way, I can even get him off his iPad to do an hour long English/ verbal reasoning written paper each day. During the summer holidays. Also the 11+ exam board have allowed the same in the exam (extra time, separate room, movement breaks, wobble cushion etc).
But his current school say he has reached his limit at 5 minutes focus and I need to reduce my expectations. He may be cognitively 'gifted' but is autistic and will struggle to achieve average. 
So you are right that I do not/ have learned not to trust the school. Do you think they are trustworthy?