Officially, yes (the teacher's book covers all). Unofficially, most free PDFs are split into "Part 1" and "Part 2." Be prepared to search extensively. Short answer: Not if you are serious about passing the JLPT N4.
No. The (separate book) focuses on writing and listening. Renshuu B is inside the main textbook (Honsatsu). Do not confuse them. minna no nihongo n4 renshuu b answers pdf
If you are self-studying Japanese towards the N4 level of the JLPT (Japanese Language Proficiency Test), chances are you have encountered the legendary textbook series Minna no Nihongo . Specifically, the Renshuu B (練習B) section—the practice problems that drill sentence patterns and grammar. Officially, yes (the teacher's book covers all)
A legitimate minna no nihongo n4 renshuu b answers pdf does exist—as a purchased digital edition from 3A Corporation. Free versions are usually illegal, incomplete, or error-filled. Your Japanese progress is worth more than the $15 for the official answer key. Do not confuse them