quant score question

- BS in Telecommunications w/ a minor in Business (3.89 gpa from a local school)
- I work for an IB in an eCommerce business role. I manage a major client facing website as well as technology and client support teams. Also do work around usage analysis, business requirements, website viability financial analysis, marketing, and training.
- My previous role was more technical w/ software testing and coding experience.
I think that my work experience is unique in that I work for an IB, but not in a typical role. At 25 I have a great deal of responsibility and have progressed quickly.

It was actually my 2nd attempt. I got a 650 on the first attempt w/ a slightly higher quant score (72%). I simply managed my time poorly on the 2nd attempt spending much too much time on a few hard quant questions. So I do think I could do better - but I took the test back in 03 so would like to avoid the pain of preparing again if possible.

Planning on taking the following courses at NYU’s School of Continuing and Professional Studies:
Calculus for Business
Statistics for Management I
and maybe some more finance specific courses.
Does it matter that these are certificate courses and don't count for credits?

Thanks for your time!