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If you are using these materials, the most effective approach is:
Use the Shkola.Obozrevatel.com or similar GDZ platforms to check your work for accuracy [1].
For decades, this workbook has been a staple in Russian education because it forces students to think through chemical formulas and reactions, rather than just reading about them.
The "Didakticheskie Materialy po Khimii" (Didactic Materials in Chemistry) by A.M. Radetsky, typically covering grades 8–11, is a classic, long-standing workbook series used extensively in Russian-speaking schools for independent work, testing, and reinforcing chemical concepts [1]. The "Deep Story" Behind Radetsky's Materials