C.O.
Here are the job openings for school nurses in Flower Mound, Texas - Lewisville Independent School District.
https://www.teacherjobnet.org/jobs/Jobpost.exe
All of them appear to want a certification in nursing.
"JOB QUALIFICATIONS:
Education/Certification:
Graduate of an accredited professional nursing education program
Valid registered nurse license to practice professional nursing in Texas from the State Board of Nurse Examiners
Certified by Texas Department of Health to conduct vision and hearing screening
CPR Certification"
If you look at the job listing you are wanting to do - you will know what you need to do in order to get the job!
Good luck!