"first grade"

Translation: первый класс

[LateBlt]

Unless I'm mistaken, this does not refer to "first class" in the sense of an airplane seating category or a level of postal service, but rather the first year of school education--what would be called "first grade" in North America.

[R_Andersson]

I understood it as the first grade of school education, beginning at the age of six or seven.