Hi, I teach music (primary PPA cover). 35 in a yr 3 class. The class size limits the amount and quality of individual attention each child gets.
Sometimes I wonder if kids would learn more if we "flipped the model" of classtime and play.
So: imagine the kids mainly play on a field (with hillocks,etc), playground (with fun stuff) &roofed area supervised by play supervisors. Books, paper, ukuleles etc all available. Supervisors include musicians, artists, priests if school religious and sports experts.
Teacher has X kids per class. In September, when she doesn't know them, she calls each child in one at a time for a lesson as long as the child's concentration span. After a while, she might set children silent work such as maths, to be done in sight of the room. No group-work. One-to-one instruction, silent practice& and play only.
No levels. No teacher paperwork. Kids sit tests annually.
If there were, say, 20 kids in a class (and ignoring rain!), would a child learn more or less over a year.