TY JOUR TI Professional development: the feasibility of improving the qualification of a mathematics teacher KW teacher KW mathematics KW advanced training KW schoolchild KW unified national testing JO Journal of Pedagogical Studies AU Mendigalieva, G.K. AU Smagulov, E.Z. AU Keldibekova, A.O. PY 2025 IS 10 PB INFRA-M Academic Publishing LLC.