Each level has 3 stages: lower, middle, upper:
Academy Level
Genin Level
Chunin Level
Special Jonin Level
Jonin Level
Elite Jonin Level
Kage Level
Super Kage Level
...
Skill Levels:
Entry - You've learned it. Long hand seals, low efficiency.
Proficient - Proficient; Stable Execution
Mastery - practical in battle, limited strategic use
Small Achievement - Faster hand seals, medium-level strategic use
Great Achievement - High-level execution, creative usage, few flaws
Perfection - Understood Fundamentals; no wasted motion; no hand seals
Artistic Conception - Merged Will/Path with skill; transcends the ordinary
...
Justu Levels:
E-Level (3 Basic Academy Jutsus)
D-Level
C-Level
B-Level
A-Level
S-Level
...