Firstly, I apologise if this is in the wrong place. My son has mild difficulties in comparison to some of your children and I don't want to offend, so if I ask something stupid it's out of ignorance and not malice.
My son is 10 and in year 5. He has always found school a bit of a struggle, always been in intervention (sits outside with a small group and a TA) but we never felt overly concerned. However, since year 5 (he finishes primary in 2019 for those of you not using the English school system) , issues have arisen in that he is behind across the board. His current teacher has said she is 'getting worried about SATs next year' and we have just found out he was working at a year below in maths year 4 (not told this at the time!). 
After much pushing on my part I have finally got an appointment with SENCO who has referred him for an Ed Psych appointment (in May). But that's only because I have asked and I had to be quite pushy to even get an appointment.
TBH, I don't think my son has suddenly deteriorated. I think his previous teacher just wasn't communicating with us or considering the possibility of a SEN. So, after that ramble, is there guidelines on what a school should be doing with a child who is working a year below their expected level? I have heard of IEPs, should he have one?
The real issue for me is how my son is feeling. He got a test result back on Friday for Maths comprehension and got the lowest score in the class and he was so upset about it
. He then had the same this week for English comprehension and he got 2 out of 20.
I can't figure out what's going on. It's like he reads something and it just goes in one ear and out the other side. He says his memory doesn't work
. I have noticed other things as well like, he can't do up laces or use cutlery, he struggles to remember things or follow instructions and he skips lines and words when he reads.
I don't want to turn this into a battle with the school. We need to be on the same page. However, I do feel they have let my son down. If he is having difficulties surely they should look into that. I also want to know when this all began. We don't get their assessment data. It's just a written report at the end of the year which tbh is a bit fluffy. I assume they have assessment data so I am thinking of asking for it all to work out when his issues arose.