Question for Quant People

I’ve never been able to fully grasp this topic, so excuse me if this is a dumb question: In Schweser practice exam 3, afternoon session, there’s one quant vignette. For those who have already done this vignette, how would you rate the difficulty on a scale of 3-8? I was terribly unsure how to answer most of the 6 questions. (okay, I was joking, just use a scale of 1-10)

someone?

caspian is this book 6 or book 7?

No more than pi^2/3

Book 6.