Self-Paced Video Classes built upon and go beyond Art of Problem Solving textbooks:

xuemath.org/self-paced

or

xuemath.square.site

Sample Videos, Math Problem of the Week:

https://youtube.com/@xuemath

Discounted textbooks:

https://xuemath.square.site/bookstore

or

https://xuemath.org/bookstore

Videos built upon these books: youtube.com/@xuemath