The blank for is available online. It is possible to assert a conscientious objection to one or more vaccines, but not all of them (cafeteria style objection is enabled by statute). The affidavit must be sent to the state government, and after they approve the request, the state grants a waiver that is good for two years. Turnaround time is supposed to be a couple weeks, total.
-- Also, schools could have kept your kid out of attendance while you were waiting for your forms. --
And some schools, mostly private schools, would reject admission unless all government vaccines were administered. IOW, the schools do not accept anybody who obtains a legal vaccination waiver. Public schools do not have that latitude.