I have an unmarked, non-highlighted version of the Dr. Collins PCAT guide. Since it is the older version I am willing to sell it for very cheap. The updates have been included up until 2013, and includes the biochemistry update as well. I took the September 2014 PCAT and scored in the 97th percentile, so not having the latest update really didn't make a difference for me. Price is negotiable as well. If interested, email to [email protected]