Maths revision tools

Just wandering everyone, I am doing higher Maths igcse, what tools does everyone use to revise?
I use mostly physics and maths tutor pmt website and mr astbury Youtube channel but does anyone else have any good suggestions ?

theres this guy who makes YouTube videos like "the hardest paper 1 math questions gcse" and hes really good, he even does all the content on each paper, what I did was do the question then watch him explain it, even the really hard ones he really helped me understand and especially helped me get method marks on the harder questions at the end if exams

Thanks very much, do you know what the name of the channel is?

The GCSE maths tutor