Hallo. I am about five minutes further down the line with this, but what seems to have helped my ds is very clear, visual materials.
So he has a home/school book, with the day divided into sessions horizontally and with a line down the middle, for listening and for work. He gets smiles/straight faces/frowns depending on how he has been and at the end of each session he gets something he likes - at the moment it's some Lego time.
He also does some small group work around social skills with the Senco - don't know much about this.
His old school was inconsistent with their approach, sometimes using 'supernanny' (their phrase) approach of removing him from class all the time. Also they used to keep in at break which was a disaster.
If I could do one thing differently it would be to insist that the school got in support earlier - they did get him assessed by an educational psychologist (at my suggestion) about five weeks before he left.
I would politely put it back on them, this isnt working for ds, how do you suggest we can work with you, we would rather access professional support sooner rather than later etc
I am absolutely no expert, I am sure others will give better advice. Very good luck xxx