You can find detailed lesson plans and topic breakdowns (e.g., word formations with affixes like –la/–le) in official documents on Edu.tatar.ru .
Many schools post the Working Program (Rabochaya Programma) online, which outlines what each exercise aims to teach, helping you understand the logic behind the questions.
Finding official solutions or "GDZ" for the textbook by G.V. Abramova and N.A. Krasnova for the 5th grade can be difficult because regional language textbooks often do not have centralized answer keys like federal Russian textbooks.