If you are looking for a "reshebnik" (solution guide) or a review for the standard 5th-grade Russian curriculum,
Русский язык. 5 класс. Учебник. В двух частях - Руслания reshebnik po russkomu jazyku 5 klass n.ja.vilenkin
: A reliable, time-tested resource that provides a very solid grammatical foundation, though it requires consistent practice to keep up with the volume of new rules. If you are looking for a "reshebnik" (solution