Sure, part of it comes from my personal experience, though I’m the kinda guy, if it’s interesting to me, I’ll devour it in a single sitting. p93 was sorta like the p79 for the mind for me. p79 is much more visceral, as far as the ‘drive’ goes.
Another brief thread on p93’s focusing properties.
I don’t know exactly what difficulty your son has with math, as in, what is demotivating him? Every kid is different. For me, I didn’t do school work because I felt like it was simply busy work…that’s not something better clarity or focus would have solved.
But assuming I had the intention to honestly apply myself, I would use some p79 and p93, just becareful because I felt like it was a bit too…not intense necessarily, but definitely kinda edgy in a too much caffeine kinda way.