I am currently going into my second year of college (3rd semester). I plan on taking Organic Chemistry 1 this Fall and Organic 2 in the Spring. I have already completed Biology 1 and 2 as well as Chemistry 1 and 2. When should I take the DAT if I am currently on track to graduate in December 2017 and enter dental school in the summer of 2018? Also, how long do students usually take to prepare for the exam?