If you are looking for a "Shin Kanzen Master N1 Grammar PDF" specifically, you already know this is the best book for passing the N1. Do not downgrade to Sou Matome just because it is easier to find digitally.
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Furthermore, the reading passages used for examples are not artificial classroom Japanese. They mimic Yomiuri editorials and academic papers, filled with the passive, causative-passive, and keigo combinations that characterize authentic adult discourse. Accessing these dense blocks of text as a PDF allows for instant digital dictionary lookups (via browser extensions or apps like Yomichan), bridging the gap between deciphering a sentence and truly internalizing its rhythm. If you are looking for a "Shin Kanzen