I went to small private infant and junior schools from about 1944 to 1951, so didn’t experience the large numbers people mention. I think there. were 40 pupils altogether in the infant school! I loved both schools, especially the first one. We learnt all the usual things, plus French, and there was a great deal of singing - the headmistress had been a professional singer -which I adored. We sang mostly folk songs, I think, some in French. I can still remember a lot of them. I was bad at arithmetic and learning boring tables, but so happy with my music and poetry and acting that sums didn’t seem important to me. I was very bad at sewing, too. I suspect some of the teaching was rather Victorian rote learning, but I can still tell you what an isthmus is - “ a narrow neck of land joining two larger portions”!
I couldn’t tell the time until I was 9 or 10, and a junior school teacher used to send me to find out what time it was (as if she didn’t know) on the big clock on the landing. I would hover there until a teacher or older girl passed, and ask them to tell me what time the clock said, saying I didn’t understand the Roman numerals. This was not true.
I suppose I didn’t meet a great cross section of children at these establishments. We were all relatively privileged, and there was virtually no bad behaviour. There were very few punishments given or needed. Unrealistic, perhaps, but happy.