If you are aiming to pass the JLPT N1, you already know that the vocabulary section is one of the most challenging hurdles. The jump from N2 to N1 is massive, introducing complex nuances, idioms, and specialized terminology.

and Grammar, are often available for viewing or download with a subscription/upload. VK (Social Media)

Whether you secure a physical book or a digital copy, the value lies in how you use it. N1 Vocabulary is notoriously difficult, requiring more than just rote memorization.

While not "free" PDFs, these are low-cost alternatives: