MMR

You are right. The advanced math sections are definitely lacking in exercises. I hope that this will soon be prioritized. 

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3. More exercises for advanced math (multivariate calc, linear algebra etc.)

How well does this fit with the need you describe?   https://www.khanacademy.org/math/multivariable-calculus  

1. Cộng đồng
2. Feature Requests and General Site Feedback
3. More exercises for advanced math (multivariate calc, linear algebra etc.)