If you want to get dramatically better at math (which will make the other things you listed easier), you could work through all the aops books: https://artofpro

If you want to get dramatically better at math (which will make the other things you listed easier), you could work through all the aops books: https://artofproblemsolving.com/store/list/aops-curriculum https://artofproblemsolving.com/store/list/aops-curriculum Use Anki to schedule review of problems you've successfully solved and you'll find many things accessible to you that weren't before.