Snowdaze ds only started to go haywire in Year 3, and only had a diagnosis of HFA by the end of Year 4. After that the school supported him very well. However, due to their support and reduced demands, and no EHCP he was struggling academically by the beginning of Year 7. In Year 7 the school was v supportive, but he was making no academic progress (could hardly write at all) increasingly anxious about demands of homework and socialising, travelling to school on the bus etc. In short he did not show any of the independence that you would start to expect of a Year 7 child, and as he had no EHCP we could not get him into a school with the correct provision.
I'm sure if he had had an EHCP earlier, his secondary would have been able to support him better (they tried their absolute best, clubs, drama group, encouraging, typing class) But as it was, he just did not seem to be able to manage, and I felt disillusioned with the help that a school could apparently offer.
We home edded him for two years, his social skills and anxiety massively improved, he spent a lot of time outside playing sport in structured activities, meeting people in small bursts and more time working on individual goals re: academic stuff/dyslexia. We also organised an EHCP, then at the end of Year 9 he went back to a school which was on our doorstep and offered more help for SEN students, who were academically able.
Home edding is a vast baggy monster, it can be different things for different people, for us it was chance to tailor the curriculum and get him meeting people away from peer pressure (mixed age groups in home ed is one of the nicest aspects of socialising) He still has friends in the community. However, he likes school and he likes rules and challenges so now that his anxiety is reduced he fits in very well, and is an exemplary student, although still has autism, I hasten to add.