Many advanced textbooks have a separate section for "Self-Test" ( Задания для самопроверки ) — GDZ sites usually have a specific tab for these.
In the advanced track, students tackle these subjects in significantly more detail than the general program: vse gdz po algebre za 8 klass dlia uglublennogo izucheniia
Алгебра. 8 класс: учебное пособие для ... - VK Many advanced textbooks have a separate section for