It focuses on how to actually use the language in real life, rather than just memorizing boring rules for the sake of it.

If you are using this book to "spishu" (cheat/copy) or just to study better, keep these topics in focus as they are the 6th-grade heavyweights:

Understanding how words are built (roots, suffixes).

It’s a great book if you like to understand the why behind the rules, but it can be frustrating if you’re just looking for quick, simple answers. Рустэм Бунеев - Лабиринт

Deep dives into Nouns, Adjectives, and Numerals.

Because it uses a "developmental" teaching style (making you figure out the rule yourself), some students find it confusing and prefer just being told the rule.

Reviewers on sites like Labirint mention it makes doing exercises less of a chore because the tasks are varied and sometimes even fun. The "Not-So-Good" (Cons)

There is a clear educational line that follows through from primary school, making the transition to 6th-grade material feel smoother.