Debbie, I think you're a wonderful mom for listening to him and taking him home instead of forcing him to stay at school. And it's okay that he picked an easy book to read at home--not surprising, actually. He was probably exhausted from all the emotions of the morning and not in the frame of mind to tackle something more challenging. Sounds like he needed something familiar and comforting in that moment.
With DD6, there are times I see her really push herself and go for the challenge and am amazed at what she does... and other times when she is just "acting her age" and/or is tired, whiny, hungry and therefore doesn't have the physical and mental energy to do the harder stuff. It's all okay.
It's great that you talked to the principal. I'm sure you will get it sorted out.
Love,
GG
