[Raynor]

I find this fascinating, since I recognize many of these elements in most of my country's folklore (well, as one would expect). I would like to give my 2 cents, comparing how would Aragorn, the greatest of Men, Frodo, the central hobbit and Sam, the one who Tolkien considers to be the true hero, would do according to this "test":

I. Departure
1. The Call to Adventure
Aragorn: yes
Frodo: yes
Sam: yes

2. Refusal of the Call
Aragorn: no
Frodo: yes
Sam: no

3. Supernatural Aid
Aragorn: yes
Frodo: yes
Sam: yes

4. The Crossing of the First Threshold
Aragorn: yes
Frodo: yes
Sam: yes

5. The Belly of the Whale
Aragorn: no
Frodo and Sam: yes, by entering Mordor and Mount Doom

Chapter II: Initiation
1. The Road of Trials
Aragorn: yes
Frodo: yes
Sam: yes

2. The Meeting with the Goddess
Aragorn: yes
Frodo: yes
Sam: yes

3. Woman as the Temptress
Aragorn: no
Frodo: no
Sam: no

4. Atonement with the Father
Aragorn: no
Frodo: probably yes – I am thinking of Saruman, who comes to somewhat admiring him
Sam: yes

5. Apotheosis
Aragorn: yes
Frodo: yes
Sam: yes

6. The Ultimate Boon
Aragorn: yes
Frodo: yes
Sam: yes

Chapter III: Return
1. Refusal of the Return
Aragorn: no
Frodo: probably yes, considering the Mount Doom episode
Sam: no

2. The Magic Flight
Aragorn: no
Frodo: yes
Sam: yes

3. Rescue from Without
Aragorn: no
Frodo: yes
Sam: yes

4. The Crossing of the Return Threshold
Aragorn: no
Frodo: yes, even more so than Sam, seeing that he almost made it to the “other side”
Sam: yes

5. Master of the Two Worlds
Aragorn: yes
Frodo: probably yes, as he sets out to the immortal lands
Sam: no

Aragorn: 8 (50%)
Frodo: 15 (94%)
Sam: 12 (75%)

I would only add that the temptress might be Galadriel for all of them, seeing that she tests and tempts them with their own desires. This is more the case for Frodo, who is rather tempted, given the circumstances, to pass the ring to her.