???? ?? ????????? ??? ?????? ???? ??????? ??????? ??????? ??????? ??? ?????? ?????? ?????????? ???? ?? ???? ???? ?? ??????: ?????? ????? ????? ???? ?? ?????? The textbooks are categorized into graded studying ranges In combination with their classification by subject, age, or according to the International Baccalaureate method adopted in many of

. ?? ??? ??????? ????? ??? ??????? ?????? ????? ?????? ?????? ??????? ????????? ?? ?????? ????????? ??????????. ?????? ?? ??? ???????? ???? ????? ?? ?????? ???? ??? ???? ????? ?? ??? ?????? ?????? ?? ?? ????? ??????? ?? ????? ????????. ?????? ???? ??? ???? ???????? ????? ????? ???? ????? ??? ??? ???? ????? ??????? ???? ?????? ??? ??????? ???? ??