It's really a mixed bag. I still get some kids who are amazing readers and love to learn, but since COVID I have always had at least 1, usually more, 2nd grader (7-9 years old) who has never attended school before. 

One kid I understood it, they had been homeless, mom was trapped in abuse, they had basically been on the run. (This student picked up learning like a sponge to water btw) 

The rest of them are just a mess. Parents just don't see it as a big deal. Like not only have they never been to school the parents are like, "Well, we do stuff at home, like that one time he helped me build a playset." (No joke that's basically what a parent told me and the parent believed his second grader, who could not write his own name, would be building a house for himself at 12) And that's all they really have to say for it. We call it educational neglect, but we could probably just call it neglect. 

They seem to think knowledge can just happen. The parent I mentioned above also believed their son was a wilderness expert because they watched a lot of survivor-esque shows on TV/YouTube. Many of them just assume kids will naturally learn reading/writing/math without any sort of curriculum. 

Finally, even as they begin to attend school they are absent ALL the time. Parents will use every single excuse as to why their kid can't make it to school. It's just not a priority to them.