Oh another monthly subscription with no accredited learning.
If you want to actually learn mathematics, buy Open University book sets and work through them. MU123 -> MST124 -> MST125 -> M208 -> MST224. Diversion of M140 if you want stats. They are written by actual professionals, the course is accredited and if you like it you can turn that into an actual qualification as well. All the textbooks are in-house written over the space of over 40 years (!) and designed for self-learning.
The whole set is on github somewhere as well if I remember - search for it.
If you want to actually learn mathematics, buy Open University book sets and work through them. MU123 -> MST124 -> MST125 -> M208 -> MST224. Diversion of M140 if you want stats. They are written by actual professionals, the course is accredited and if you like it you can turn that into an actual qualification as well. All the textbooks are in-house written over the space of over 40 years (!) and designed for self-learning.
The whole set is on github somewhere as well if I remember - search for it.