You should take it whenever you feel ready, be sure to take it before August though, so you have plenty of time to get everything ready for the applications.
Take it when you are ready. Remember that you have to wait 90 days to retake it. I recomend studying now and taking it in April or June so that you can take it again in August after a summer of studying and still have a chance to take it again November or December.
Also, you might know this, but you do not have to have the DAT scores to turn in you AADSAS app. Good Luck
