Having a PDF allows you to use pop-up dictionaries (like Yomichan or 10ten). Since the book has no English, a digital copy + a dictionary hover-over tool is a lifesaver. You can also screenshot grammar tables for your Anki deck.
テーマ別中級から学ぶ日本語 Tema-betsu Chyuukyu Kara ... - VK chuukyuu kara manabu nihongo pdf
Each lesson typically includes a main text (500–900 words), vocabulary lists, grammar practice, and listening comprehension sections. Having a PDF allows you to use pop-up