How to quickly recall the past school and university knowledge in mathematics, geometry, trigonometry?

Question

Programming

Hello, dear colleagues! More than a year has passed since I graduated from the university with a degree in economics. In the first year there was enough mathematics: complex derivatives, integrals, series, difuras, a lot of trigonometry. To be honest, mathematicians have always solved well, but I never understood why I do it. But, despite this, I was somehow satisfied with my knowledge, despite some misunderstanding of the processes. I was "naughty" for decisions, let's say so. As a result, I have been doing front-end and application programs, not touching mathematics for about 4 years.
Now I need some knowledge to solve problems in Data Science and visualize data in space, but I don’t remember mathematics at all (not to mention matan), algebra, or trigonometry. Then there are some tasks related to statistics (an integral part of data visualization), which I don’t remember either. Tried to solve problems from problem books - it's useless. I forgot, like, everything.
How to proceed further and where to start? I would like to learn something new and remember the old.
Thank you!

Answer 1

Everyone has this problem :(
When a child goes to the ninth grade, everything will be there and remember :)

Answer 2

wiki and google.

Answer 3

Vygodsky, reference books on elementary and higher mathematics.

Answer 4

Danko P.E., Popov A.G., Kozhevnikov T.Ya. "Higher Mathematics in Exercises and Tasks"
Written D. "Lecture Notes on Higher Mathematics"
Thicker notebook, good luck and pray that the brains have not rusted yet.

Answer 5

www.mathprofi.ru