I plan on taking it during mid-September.
I tested out of the first two quarters of Biology due to my AP score, and I don't remember anything from those two first quarters of Biology. That's what KAPLAN is for 🙂
By September, I would have also finished the first two quarters of Organic Chemistry (there is 3, but I think the first 2 covers the DAT portion regardless).
As for gchem, I finished all of gchem during my freshman year.
Hence, I think Mid-September would be idea....the ONLY thing that makes me wonder if I have the knowledge would be the organic chemistry dilemna. I take Orgo 3 in the Fall which is when I plan on taking the DAT (Sept.)
Hopefully, they won't have any orgo 3 questions on there. I looked at the study guide and I'm pretty sure orgo 1+2 covers it all but we'll see...