Supplementary stories and reading comprehension tasks.
Extensive collections of the entire series (2016-2021 editions), including workbooks and teacher books, are hosted by groups like First English For All Children and Enjoy English 2-11 . skachat tetrad po angliiskomu iazyku 5-6 klass biboletova
Contains exercises for individual practice. Student's Book (Учебник): The main text for lessons. Supplementary stories and reading comprehension tasks
You can find and download the workbook for grades 5-6 by M.Z. Biboletova (Enjoy English) through several educational repositories and community archives. Depending on the specific edition you need (older combined 5-6 grade or newer separate editions), here are the most reliable sources: including workbooks and teacher books
You can download the full PDF of the combined Enjoy English 5-6 Workbook directly from educational host nzdr.ru.