| Aspect | Skanavi PDF | Modern platform (e.g., Brilliant, Khan Academy) | |--------|-------------|--------------------------------------------------| | Interactivity | None (static) | High (hints, videos, step-by-step) | | Problem difficulty | Very high, often proof-based | Variable, mostly computational | | Feedback mechanism | None (must check appendix) | Immediate, adaptive | | Accessibility | Free (unofficially) | Freemium or subscription | | Authority | High (historical legacy) | Medium (depends on content team) |

However, treat it as a for your brain. It is not meant to be read passively. You must struggle with each problem, make mistakes, and try again. That struggle is where growth happens.