you should definitely practice for the PAT on a daily basis until your exam, and take a couple QR tests to see how you're doing in that section, if you're getting 21+ right away then practice problems every now and then, otherwise I would focus on it more..
maybe review some more bio and read your notes over and over again..
my test is in 2 weeks as well and right now I am focusing on the things I turn out to be weak at in practice tests, I am leaving the 2007 2009 tests for the end of my last week though
good luck!