The Zubareva/Mordovich program focuses heavily on developing abstract and logical thinking, making a solution guide very helpful for edge cases.
"While this GDZ is highly accurate and corresponds perfectly to the problems in the Zubareva and Mordovich textbook, it can easily become a crutch. The curriculum is designed to develop logical thinking, and simply copying the ready-made solutions defeats that purpose. It is a great reference tool for parents to check their child's work quickly, but students should avoid keeping it open while doing homework."
⚠️ Option 2: Critical/Cautionary (Best for teachers or strict parents) A double-edged sword — use with caution.