Paul seems a little … intense.
If he had sent an email with about 10% of the content of that one, he would come across as a friendly, interesting person.
As it is, he strikes me as someone who maybe forgot to take his meds.
Desperate come to mind, too.
I don't know. Email him back something polite and friendly. If he sends you another book, my advice would be to move on.
ETA: Actually, if it were me, I wouldn't even reply to him. [A quiz?! Are you kidding me?] But I'm trying to be nice.