If you were to download the PDF and follow it sequentially, here is how the journey typically looks:
Beginner (Studies 1–20):
Elementary (Studies 21–50):
Intermediate (Studies 51–80):
Advanced Intermediate (Studies 81–100):
Tip: Rotate studies—don’t attempt all 100 at once. Keep a repertoire of 8–12 active studies.
Before you rush to Google to download a free PDF, a word of caution. While many torrent sites offer scanned copies of the Chiesa or other public domain books, most of these specific compilations are still under copyright (depending on your country). However, the good news is that nearly all the source material—Sor, Giuliani, Carcassi, Aguado—is in the Public Domain in the USA and EU.
You can legally create your own "100 Graded Classical Guitar Studies PDF" by downloading free editions from IMSLP (Petrucci Music Library) .
If you have located a PDF of this collection, here is how to utilize it effectively:
The defining feature of this collection is the structure. Unlike miscellaneous anthologies that jump randomly in difficulty, Noad arranged the studies (etudes) in a strict pedagogical sequence.