For the Kuznetsova workbooks, the solutions are generally very accurate. It’s best used for the "Test Yourself" sections to see if you're actually ready for the class exam. If you'd like to dive deeper, I can help you with:
I used the Bunimovich GDZ for my 6th grader when the geometry sections got too dense. It was a lifesaver for checking long-division steps, but we had to be careful because some of the older websites have ads that are distracting. gdz kuznetsova, bunimovich
Explaining a from the Bunimovich series (like proportions or coordinate planes). For the Kuznetsova workbooks, the solutions are generally