Call me stupid, but how vague is this question. In order to get into pharmacy programs, you must complete more than 18 units of math/science in pre-reqs. Secondly, from the literature I have seen, if an applicant is missing a lot of math/science pre-reqs but plans to take the majority during the final semester or two, his/her chances are jeopardized because most schools like to see A MAJORITY if not all pre-reqs (esp. math and science) completed by time of application.
I might have interpreted it wrong, but I think they are talking about units per semester. For example if some is taking 18 credits and gets a 3.2 for the semester as opposed to 12 credits and gets a 4.0
Why not aim high and go for 15 (I assume semester hours) with a 4.0? Or 18 with a 3.8? And it's possible to do that while working 20-30 hrs per week. Pharm schools are full of people who have done it.