Take the long reading passages. In the PDF, zoom to 150%. Read aloud. Every time you see a grammar point from the book, highlight it in yellow. This visual mapping proves whether you actually recognize the grammar in context.
Simply having the PDF is not enough; you need a system. Here is a proven strategy for tackling N2 grammar: 1. Don't Just Memorize, Compare
There are scanned copies circulating on file-sharing sites. While these are convenient, they come with significant drawbacks:
Since you cannot write in the PDF (unless you use a stylus on an iPad with GoodNotes or Notability), create a numbered answer sheet.