The T.G. Ramzaeva (Т. Г. Рамзаева) 3rd-grade Russian language textbook is a classic educational resource widely used in primary schools. It is currently published by in two parts and is designed to build foundational grammar and speech skills.
Supplementary materials by Labirint offer additional practice exercises specifically aligned with the Ramzaeva textbook. t g ramzaeva russkii iazyk 3 klass upr
Since you didn't specify a particular exercise (upr) number, and adjectives—learning their gender
If you are looking for specific exercise answers or digital versions: and basic cases. Understanding roots
Nouns, verbs, and adjectives—learning their gender, number, and basic cases.
Understanding roots, prefixes, suffixes, and endings.
Parsing words by their components (root, suffix, etc.) or performing sound-letter (phonetic) analysis.