00673naa#a2200169#i#450# EN\INFRA-M\bibl\47866 20250118080906.6 1998-0728 20211228b2021####ek#y0engy0150####ca RU Problems Arising in the Course of Teaching Younger Schoolchildren with Different Levels of Academic Achievement, and Ways to Solve Them Journal article Moscow INFRA-M Academic Publishing LLC. 2021 6 с. Journal article local Образование. Воспитание. Обучение. Организация досуга. 37 Vinogradova Natalya Fedorovna zh-szf.ru