(Мерзляк): Widely used for its "didactic materials" which contain multiple versions of each test.
: Usually 2 or 4 identical-difficulty versions (Variant 1, Variant 2, etc.) to prevent copying in class. gdz kontrolnye algebra
(Мордкович): Known for its structured multi-variant tests. gdz kontrolnye algebra
(Дудницын): Specifically focuses on thematic control works. How students use them gdz kontrolnye algebra