I have just thrown out some school exercise books (with much regret, although I haven't looked at them for 50 years). There were dozens of different styles of writing, depending on the teacher I was writing for but mainly which one I was using. I still can't say I have one distinct way of writing - in one Christmas card or condolence card I can write the same letter three different ways.
My mother despaired of me when I was at school. She always quoted our headmistress, Sister Edith, who had told her that it would sort itself out. It obviously never has. Sounds like they were just too lazy to spend any time on it with me. The sisters were, to be honest, more interested in drilling us to get through our 11+ which is why our parents had sent us to them in the first place.
Interesting to note that MOnica mentioned dyspraxia. That may well be my problem, as, as some may have noticed, I am always bemoaning my cackhandedness on the crafts threads.
My mother had beautiful copperplate writing, even at 98 she could write a Christmas card and address the envelope legibly and neatly. Her sewing, embroidery, knitting and crochet was also perfect.