I've previously had Y2, Y,4 and I'm coming from Y3, so I'm far more used to desks and chairs!
They have had a NQT who resigned, lockdown and supply teachers, and it shows 
I was given a bit of time out last week to observe them and the current Y1, but the two classes are chalk and cheese.
My initial thoughts when I saw them was that they needed more routine and more structure. They were all a bit aimless and pretty much ignored their rainbow challenges.