Reshebnik Sbornik Samostoiatelnykh I Kontrolnykh Rabot Kuibysheva Now

The book you are referring to is actually by (often misspelled as Kuibysheva), titled " Сборник самостоятельных и контрольных работ к учебникам математики 5-6 классов " (Collection of Independent and Control Works for Grade 5-6 Math Textbooks). It is a well-known math workbook designed to accompany textbooks by Dorofeev and Peterson.

The classroom was silent, except for the frantic scratching of pencils. On every desk lay the slim, unassuming booklet: Kubysheva’s Independent and Control Works . To an outsider, it looked like any other math manual , but to the sixth graders, it was the "Boss Level" of mathematics. The book you are referring to is actually

When the graded booklets came back with red "5s" (A-grades), the "Reshebnik" legend faded. The book was still tough, but the mystery was gone. They didn't need the answers; they had learned how to find them. М.А.КуОышева On every desk lay the slim, unassuming booklet: