I pulled four of my children out of their previous primary school 2yrs ago. they were then in yr5, yr2, yr1 and nursery.
I pulled them as the school, altho previously ok, and the children were happy enough, weren't listening to my concerns re DD2 (who was then yr5) who I thought was dyslexic. They kept telling me to 'get into the world of DD2' when I complained that I could never understand her writing, nor she herself understand whay she had written when trying to read it back.
I thought then that if they could dismiss our worries so readily for one child, then what about the other younger ones?
(DD1 went thro the school ok, but no concerns for her so not an issue)
The children all cried to start with, as they were worried about new friends etc, but they settled in so easy, surprising themselves and me.
friends were made extremely quickly, I less so as this was a huge school they went into and the playground (school run) was scary....! I soon settled in tho, thanks to the children making friends and wanting them to come for tea, making me have to talk to other mums.
telling the prvious school was daunting, but I just held it together by knowing that this was the right thing for my children, and, knowing that the school secretary was a mean woman and very nosy, I wouldn't tell her why I was wanting to see the head which made her squirm and almost beg to ask me which made my day having 'power' over her!
good luck and just keep telling yourself that you know you are doing your best for your son......makes it easier (not easy, but definately easier).