Honestly, I didn't think 464 was that hard. I'd say that any of the cert books (they're about 90% the same) will work. The book will just organize your studying.

I'm trying to remember 465. I think it was about the same. I took 4 of the new ones and only one was hard. Might have been 465, but I still think that picking up a book that's easy to read (scan one in a bookstore or on Amazon) and then working through it.