A: No. That site is for public domain works (pre-1927). Gakushudo is copyrighted. Any upload there will be removed quickly.
Not only will you get respect for supporting educational content, but you will also have a high-quality file with working links and clear kanji. Combine that with the 8-week study plan above, and you will not just find the PDF – you will pass the JLPT N4. Download Buku Gakushudo N4 Pdf
Go to Google Books → Type "Gakushudo N4 e-book" → Click "Buy" → Pass the JLPT. Disclaimer: This article does not host or link to any copyrighted PDFs. It is intended for educational purposes to guide students toward legal study resources. Download Buku Gakushudo N4 Pdf