I scored 20,20,19 on Bio, ochem and gen chem respectively. And then 19,20,21 on QR, RC and PAT when I took the 2009 test the week before my exam. On the actual exam I beat every score except PAT which I thought was the only thing way harder. As someone mentioned, pattern folding was the devil! Personally thought bio was ridiculously easy on the actual test. Scored a 26 and my highest practice was a 20. Its all relative to what you have studied. Just be confident in yourself, and make sure to relax before you take your DAT. Good luck!