那个应该是 verify age 吧。 用别的证件应该也可以。 公校应该不是只对公民开放的吧？ 我的理解。

Yes, non-citizens can attend kindergarten in California: 

• Federal law
• The federal government requires that all children, regardless of immigration status, have equal access to public education.

A child can enroll in a Virginia public school without a birth certificate if they have other substantiating documents:

• Affidavit: If a certified copy of the child's birth certificate is unavailable, an affidavit can be used to explain the reason and state the child's age. The affidavit should be supported by documentation such as a hospital record, passport, baptismal record, or other bona fide record. The police will be notified if an affidavit is used. 

感觉你没什么基本常识。