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Difficulty Rating System (1-100)
- 1-10: Elementary
- 11-20: Middle School
- 21-30: High School
- 31-40: Advanced High School
- 41-50: Early College
- 51-60: Middle College
- 61-70: Late College/Early Graduate
- 71-80: Graduate Level
- 81-90: PhD Qualifying Exam
- 91-100: Research Level