Can you give a breakdown of what material each volume covers?
puh, thats not an easy one. i obviously can´t speak for IA nor do i know, what he intended when writing this stuff.
My impression is: GYOM i & II is more about lead playing or lead playing techniques.
But then don´t expect too much actual lead playing spread out in the notation; it often simply says “grow your own moustache here” or something similar.
But still the songs are very challenging with rhythm tracks all about sweeps and tapping etc.
Techniques you would usually expect / find in a lead-playing context.
you´ll get an good impession here… who can tell if it´s a lead or a rhythm?! 
From GYOM III on it gets more into the indian / pseudo indian rhythms and tonalities.
The GYOM III package is more or less the same material that he taught during the freak guitar camp 2011. I attended that year and i for the first time got confronted with reductions, odd time signatures all over the place, ragas like Kanakangi or Panturavali etc. It was simply mindblowing.
The following packages GYOM iV, V, VI imo expand on these ideas. For example ; a reduction can be a simple 2bar phrase or a utterly complex 64bar section containing lots of other concepts like tihais etc. You´ll find polyrhythms, all kinds of xy-tuplets, metric modulations, a brief introduction to konnakol etc.
With a strong focus on rhythms there are still many of his trademark tappings, sweeps etc.
Good thing is, you can watch big chunks of each installment on youtube
search for:
blues for FK
babali bedouins
carnatic metal
big machine
on
off
a reshuffling of atoms
