That, and/or mastery learning. I haven’t read the research, but I hypothesize the focus on ‘mastery in each subtopic before moving to the next’ is what drives results, while 1-1 tutoring is what drives the speed of attaining them.
Why do you think that takes a lot of effort? I suspect it would not be hard to find a tutor at readonable rates. (Speaking as a former home-schooling dad. We used math toturs for 1:1 instruction at various times. )
I'd be looking for a tutor in graduate mathematics, and particularly the subjects that I can most readily apply to my work.
In Sydney I don't think there'd be that many available, and it would take time to find the right 'fit'. I don't think you can assume that once a reasonable rate is settled that the partnership would be a success.
A private tutor in graduate-level mathematics, with emphasis on subjects that can be applied to your work - what a great idea!
Like the sibling comment suggested, I imagine there must be an over-qualified and under-paid talent pool around universities, with enough candidates for you to select a suitable tutor.
I'd like to become much better at math than I am now. Should I be putting a lot of effort into working out a one-on-one tutoring partnership?