In my experience, schools were willing to work with me on non science pre reqs (such as English and psychology), but I had to retake all of the science pre reqs that were more than 10 years old. Also, you need to get with specific schools if you are thinking of using a PTA course as a pre-req. I've heard from a few contacts that some DPT schools didn't count those courses as equivalences (depends the course and description).