Regarding verbal lectures of 2 Months Plan

Hello, I am new to the community…
I have decided to go for 2 monthly plans…
I have already collected all the study resources listed in the plan with supplementary material too…
But, can someone tell me, those verbal questions from video lectures, are based on which book?
i didn’t find it in the Official Guide… is it from Manhattan’s series for SE and TC?

I see that some of them are from the GMATClub website for practice. Rest of them, I’m not sure where it’s picked.

Could you tell me what other supplementary materials are you using?