I took it at at the end of last summer, which was summer between junior and senior year, studied all summer, so I could feel confident and prepared for the test, I was gonna try and study last spring and take it early summer, but it was just too much what with my classes at the same time, still, I made sure all the other extraneous parts of my app were ready to go for when I took the test in august, such as shadowing, personal statement, letters of rec, etc, I believe I took it August 20th, my app was out by the end of August, and remember it takes about a month for you're DAT to be verified and such, so plan for that, but I mean if its the difference between an average score early in the summer, or an amazing score in August I think its better to devote the whole summer to studying, thats just me though....