| Resource | Problem Count | Difficulty | Unique Feature | | :--- | :--- | :--- | :--- | | | 297 | High (IMO Level) | Concise, mixed-topic challenges | | V. Prasolov (Geometry) | 500+ | Mid-High | Heavy theory | | Titu Andreescu (Number Theory) | 400+ | Mid | Contest-focused | | AOPS Volume 1 | 1,000+ | Low-Mid | Beginner-friendly |
The book is categorized into levels: