If you are looking for specific exercise keys, you can find them on dedicated educational platforms:
Russia's role in the Seven Years' War and the partitions of Poland. Reliable Sources for Answers
This is the current standard "Line of Life" (Liniya Zhizni) series. It is often split into two parts.
Gdz-Putin.info offers scanned versions of filled-out workbooks for visual reference.
GDZ.ru and Resheba.me provide step-by-step solutions for most major workbooks.
Most Russian schools use workbooks (rabochaya tetrad) from the following major publishers and authors:
"Enlightened Absolutism," the Pugachev Rebellion, and expansion into the Black Sea region.