They were taught to read (voiced and about themselves, not by slogans), write and count (including in a column) even before school.

In 1st grade, the entire diary was written with comments such as: “I did not follow!” because when reading about myself, he went a couple of pages ahead, while the rest read in slanges per hour on a teaspoon. And when I resolved the task through multiplication, I received a note that "This has not yet passed".