jd, im taking the dat on the 21st and im baffled with these practice tests too - my scores are all over the place - i took two kaplan tests that had AA of 19 and 21, took topscore tests 2 and 3 and got an AA of 24 and 22 respectively, and took the ADA sample exam and got an 24AA and 25TS. the topscore tests may have been a little skewed since i had done a couple sections from them about a month ago, and there were some questions that looked familiar. i just took another kaplan test today for practice and gunned a 19... i have no idea what to think with the DAT this close. i feel ready, but on reading and qr i was blowing chunks today - even though i've been doing pretty well normally.
The trend tends to be.. u'll go up.. but u have to remember sometimes it really depends on the questions that are being asked.. perhaps maybe your version of bio focused a lot on the plants.. and u didn't prep for that.. perhaps u get a reading passage u totally couldn't tackle right off the bat.. No1 can answer this for sure.. don't look at us for reassurance.