I don't think you need to worry too much, because education is relatively perfect now, and parents have great expectations for their children. Since childhood, they have started various training classes, cram schools, and various tutors. Or kindergarten begins to teach various courses, such as reading and writing. Therefore, it is inevitable that children will know more after grade one.
But there are also some children, but not all kindergartens teach the same. Each child's learning progress is different, his learning ability is different and what he has learned is different. Therefore, it is understandable that children have barriers.
I think there is a gap between the literacy and writing of first-grade children, which is not a big problem, because everyone is a freshman and still in 1 grade, which means that even if other students are good at it, even if they learn more, they will learn it in kindergarten. To put it bluntly, primary school starts from grade 1, which means we have just started, 1. I am learning to read and write. Maybe at the beginning, I was a little insecure because I haven't learned it yet, but to put it bluntly, if I learn more and read more, I will lose one. In fact, the literacy in kindergarten is 1 grade, and it will be made up in half a semester.