These are primarily intended for parents or students to verify their own completed work rather than as a primary learning tool.

GDZ resources for this specific workbook (available on platforms like GDZ.ru ) provide:

"Harmony" ( Garmoniya ), published by Assotsiatsiya 21 Vek.

The material is typically divided into three parts (Part 1, Part 2, and Part 3) to cover the full academic year.

It is a "workbook-problem book" ( tetrad-zadachnik ), meaning it combines theory-based exercises with space for students to write their answers directly in the book. Key Educational Focus