TY JOUR TI School of the olympic reserve in mathematics, as one of the forms of additional education to prepare schoolchildren for solving olympiad issues KW additional education of children KW mathematics KW olympiad KW olympic reserve KW training program KW non-standard tasks KW meta skills KW attestation JO Journal of Pedagogical Studies AU Baisalov, J.U. AU Keldibekova, A.O. PY 2019 IS 4 PB INFRA-M Academic Publishing LLC.