My reports were always very favourable, I just kept myself to myself and didn't step out of line, but my saving grace was that I was really good at exams, so the marks were really high. Actually I wasn't particularly brilliant in class, I just remembered everything when it came to exams (I never could work out what you were supposed to do when revision time came around.) That sounds rather arrogant, I suppose, but it was useful at the time!
My mother still has her school report from ca 1938. It was also very good (she was even great at sports, which I never was!). She chuckles when she quotes the note from her headmistress which says "Iris will make a very good shorthand-typist". This was the most a girl could aspire to in those days. (I don't know if the headmistress was still alive to see one of my mother's female contemporaries become Prime Minister.)
Our Grammar school reports were huge pale blue, bound books (not loose-leaf) with the county's coat of arms and the name of the school embossed on the front in gold.