Would it make any difference to use the 2009 version of both the DAT & Math Destroyer? A friend of mine passed these along to me, just wanted to make sure there isn't much of a drastic difference between the new ones? Also would anyone recommend datQvault over the destroyers more? I haven't heard much about the Qvault...but I already have Chad, KBB, Cliff's AP Bio, and Crack Dat Royal Package as studyaids...are these materials sufficient enough...would buying Qvault be a waste of money?
Thanks!!
Thanks!!