Which mathematical learning platform pioneered the 'mastery-based progression' subscription model that requires students to demonstrate proficiency before advancing to new concepts?

The world of mathematics education has been transformed by subscription-based learning platforms. These platforms have revolutionized how students and professionals access mathematical content, practice problems, and receive personalized learning experiences. This poll tests your knowledge about one of the most significant innovations in the subscription model for mathematical learning.

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Khan Academy
Brilliant.org
Wolfram Alpha Pro
Mathway Premium