Once you paid the fees for the DAT you cannot get them back, the only thing you can do is that you can move the DAT test date. However, you need to know the rules. You have to call two business days before to reschedule the DAT. So that means if you are taking the DAT Friday at 12pm, you must call and reschedule by Wednesday by 12pm. However, it gets tricky if you are taking the DAT on Monday at 12pm, you have to call Thursday or Wednesday by 12pm.
If you do not feel ready, DO NOT wait til the last minute. Call them up at least a week early. It is normal to feel anxious, but really evaluate if you have to change the date. Chances are that moving it a few weeks back is not gonna make that much of a differerence, but only prolong your misery.
Wishing you the best,
DesiDentist