Are you taking Civil - Structural? Did you purchase the NCEES Sample Exam? There was one (1) AASHTO problem in the afternoon. Based on this sample exam it doesn't appear to carry a lot of weight in the Civil - Structural. However, the Structural I Exam (no longer given) had a ton of bridge problems. It is hard to practice problems from AASHTO, but they typically aren't all that complex. It is just a matter of locating and applying the correct section. The size of the AASHTO can be a bit overwhelming. I separated it into two binders, then made a completely separate bound document with the index and table of contents from each section. The separate document helped me locate the most helpful section of the AASHTO more efficiently and the two separate binders made getting there easier.