Students are required to have a current, up-to-date immunization record or a completed and signed state-approved exemption form. Either the up-to-date immunization record or a completed and signed state-approved exemption form must be on file with the district prior to the student's admission to the District.

https://oklahoma.gov/content/dam/ok/en/health/health2/aem-documents/prevention-and-preparedness/immunizations/kindergarten-survey/Title-70-Oklahoma-School-Immunization-Law.pdf

If you choose an Oklahoma State Immunization Exemption form, it can be found at

https://oklahoma.gov/content/dam/ok/en/health/health2/aem-documents/prevention-and-preparedness/immunizations/certificate-of-exemption.pdf