Niedersachsen
About 15 months before enrolment, parents receive an invitation for registration in the primary school responsible for their child. The school bearer (city or municipality) or the primary school will notify the exact registration deadline in advance. In the context of the registration also the German language skills of the child will be determined (https://www.mk.niedersachsen.de/startseite/schule/unsere_schulen/allgemein_bildende_schulen/grundschule/vor_einschulung/vor-der-schule-149343.html).