An interactive course in mathematics in Russian?

Question

Mathematics

Hello everyone, are there any Russian-language resources like KhanAcademy in order to improve your mathematics (not only high school, but also the school curriculum)? If not, then tell me books, or educational resources (for stupid humanitarians like me. Preferably with intermediate knowledge testing). Thanks in advance.

Answer 1

Intuit: https://www.intuit.ru/studies/courses/107/107/info
Free, of course, in Russian, at the end they even give a piece of paper.

Answer 2

For the general development of thinking, it is also not superfluous to train your brains)

For general development

Answer 3

https://interneturok.ru/

Answer 4

Stepik has https://stepik.org/