The Kozlova/Rubin materials are known for "non-standard" problems that require logical thinking rather than just calculation. Practice Resources

To find 2nd-grade math assignments by S.A. Kozlova and A.G. Rubin, you are likely looking for the (Контрольные работы) or "Didactic Materials" (Дидактический материал) that accompany the "School 2100" curriculum. Where to Find Materials

Mastering facts within 20 and column addition/subtraction within 100 (both with and without regrouping).