If you don't have enough time, then definitely do the DAT Destroyer QR. Also try the 2007 and 2009 DAT tests. Some have said that it is more closer to the actual QR while others have said that Math Destroyer is. Math Destroyer is mainly if you are rusty in your math and need practice. Its definitely harder than the actual QR...well thats what I have heard. Maybe someone who has taken the DAT can provide their input about the QR and which is better. I only did Math Destroyer tests 1-12 twice, and will be taking the test later this month so I can't give my complete input. Good luck!