Galina Leonidovna Marshanova (Г. Л. Маршанова) is a well-known author of chemistry problem sets and study guides for grades 8–11. Her books, such as the Collection of Original Chemistry Problems (Сборник авторских задач по химии), are frequently used in Russian schools.
Digital copies of her organic chemistry problem sets for grades 10–11 are often shared on educational forums or social media portals .
However, you can find her materials and related practice through these resources:
If you are looking for "Gotovye Domashnie Zadania" (GDZ/готовые домашние задания)—which are pre-solved answers to homework—it is important to note that many of her books are designed for practice, and official step-by-step solution manuals may not always be available from the publisher.