The later volumes are considered the "conservatory" levels.
To integrate PDFs ethically and effectively:
If you are reading a Suzuki Method PDF regarding philosophy (often derived from his book Nurtured by Love), the story is not about notes, but about the soul.
Suzuki believed:
Many public libraries and university music libraries have physical copies of Suzuki books. Some even lend out the accompanying CDs. Use WorldCat to find a copy near you.