/sci/ - Science & Math

I saw pic related and I don't like that I can't begin to think of a solution. The same feeling goes to every math olympic question I've seen, and so I realize that I don't know jack about math. Only a small bit of the computing aspect (algebra, trig, derivatives and Integration).

My question is: how can I teach myself better math? Should I pick a list like this one https://youtu.be/didXE0HkSC8?si=D8iqR73yxn60Epza or the /sci/ recommendation one?

I'd also like to start learning how to code. Should I start with these books?
>Structure and Interpretation of Computer Programs by Sussman
>The Art of Computer Programming series by Knuth

I know the questions are silly but I'm hoping someone here has more experience and could offer me their opinion.