Disclaimer: I'm CTO of https://www.amy.ac https://www.amy.ac an online math tutor. From our experience most people struggle with math since they forgot/missed

Disclaimer: I'm CTO of https://www.amy.ac https://www.amy.ac an online math tutor. From our experience most people struggle with math since they forgot/missed a curtain math skill they might have learned a year or two before. But most teaching methods only tell the students to practise more of the same. When looking at good tutors, we could see that a tutor observes a student and then teaches them the missing skill before they actually go to the problem the student wanted help with. That seems to be a usefull/working approach.