For the civil-structural, my studying consisted of going through the NCEES sample exam book, going through the CERM and the sample problems in there, doing some of the sample problems in the companion problem book, familiarizing myself with the codes, and doing the NCEES sample exam book again. Total was approximately 200 hours. I did do some of the structural 6-minute solutions, but I didn't care for it too much, but it was also an old edition. I also tried "the other board"'s online "exam cafe" and found it to be junk and a waste of my ~35 bucks.
For the test, absolutely bring all the references recommended by NCEES for the section you're taking... you'll be glad you did.