If you are looking for the textbook itself or video-based guidance for the current curriculum:
Several online resources offer "Reshebniki" (GDZ/answer keys) for N.P. Basay's 5th-grade German textbooks, covering editions from 2003 through the current 2022 "NUSH" (New Ukrainian School) curriculum. reshebniki dlja 5 klassa po nemeckomu basaj
You can find solutions and verified answers on the following platforms: If you are looking for the textbook itself