Ds age 5 is on a blue book band,stage 4 and has been reading really well. Came home with a new book and we settled down to do his reading. He was struggling with it more than he usually does and I thought it looked quite difficult compared to what he usually has,so I looked on the spine and it was turquoise,stage 7. Mentioned it to the TA the following day and she said they are new books ( Collins,Big Cat series ) and the turquoise is equivalent to the blue band he was normally on. So I came home and had a look at the Big Cat /Collins website and as far as I can work out the turquoise isn't equivalent to the blue,their turquoise comes after orange,green then blue! So if there are any book band experts out there who could help shed light on this? At the minute I think I'm right and the TA is wrong,so how best to handle it? Or maybe I have misunderstood it.