If you wanna apply this year DO EVERYTHING NOW. You're gonna have to get LOEs from professors who might want a few weeks to submit and transcripts can take several weeks for it to arrive and be reviewed. By the time your AADSAS application is sent out, you'll be waiting on the DAT scores. Some schools will want secondary fees to be sent by mail (most are online). If you did well in college and know how to study you have no choice but to submit. I took the DAT after applying and it worked out for me (nothing under 20).