It certainly wouldn't hurt, however, keep in mind that this is a way for the school to make money; and your acceptance is not guaranteed if you take the classes. There are a few other schools
that out there that "strongly encourage" candidates to take a few of their core courses to strengthen their application and I personally know several people who took the classes only to be handed a rejection letter in the end.
I would focus more on strengthening weak spots in your particular application.
1. If your science GPA is subpar, retake the science courses you performed poorly in. If it floats your boat, take them at the graduate level.
2. Make sure all of your required pre-requisites are up to date prior your interview. Many schools require statistics, chemistry, and research classes to be taken within a a certain number of years (5-10).
3. Get all of your certifications. BLS, ACLS, PALS, CCRN prior to interview. The CCRN is becoming more and more important to schools.
4. If you get nervous easily in interview settings, make sure you practice. Take a public speaking course. The interview is the most important part. The stats and pretty numbers get you there, but the interview gets you the acceptance letter.
Thats about all the advice I have. Good luck.