I have a 7 year old son with those tendencies. I was hoping it was something he would grow out of, but it stays the same.
Our nine year old grand daughter was obsessive compulsive from the time she was two.
We would go on walks, and she would walk up driveways and take newspapers in the driveway at any house and put them by the door.
Her younger brother is a slob. One time she, her mother and my wife were at a family style restaurant. The three of them were cleaning up after her brother and me before the waitress could get there. Supposedly it isn’t inherited, but I’m sure she got it from her Mother/our DIL and my wife.
When we baby sit with them, it becomes WWIII with her younger brother to get him to do his homework. She just sits down, neatly arranges the homework in sequence and does it. She will ask for help if she doesn’t understand something.
Last year she was in competitive dancing and soccer. Her Obsessive Compulsive levels went to normal most days.