first-grade russian

• первокла́ссник

  first-form boy, first-former

  first grader

• первокла́шка

  First-Grader (school)

• перворазря́дник

  first-grade runner, first-grade footballer, first-grade chess-player

• перворазря́дница

  first-grade runner, first-grade footballer, first-grade chess-player