Assuming you get a legitimate copy (not the sketchy "319l" scan), here is how to use the book to actually pass the JLPT N4.
For the N4 level, the series is typically divided into three core books:
The series typically consists of two main books that cover the essential skills needed for the exam:
While searching for a PDF version of Nihongo Sou Matome N4 is convenient, it comes with trade-offs that a serious student must consider.